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      1 /*  Prototype JavaScript framework, version 1.6.0.3
      2  *  (c) 2005-2008 Sam Stephenson
      3  *
      4  *  Prototype is freely distributable under the terms of an MIT-style license.
      5  *  For details, see the Prototype web site: http://www.prototypejs.org/
      6  *
      7  *--------------------------------------------------------------------------*/
      8 
      9 var Prototype = {
     10   Version: '1.6.0.3',
     11 
     12   Browser: {
     13     IE:     !!(window.attachEvent &&
     14       navigator.userAgent.indexOf('Opera') === -1),
     15     Opera:  navigator.userAgent.indexOf('Opera') > -1,
     16     WebKit: navigator.userAgent.indexOf('AppleWebKit/') > -1,
     17     Gecko:  navigator.userAgent.indexOf('Gecko') > -1 &&
     18       navigator.userAgent.indexOf('KHTML') === -1,
     19     MobileSafari: !!navigator.userAgent.match(/Apple.*Mobile.*Safari/)
     20   },
     21 
     22   BrowserFeatures: {
     23     XPath: !!document.evaluate,
     24     SelectorsAPI: !!document.querySelector,
     25     ElementExtensions: !!window.HTMLElement,
     26     SpecificElementExtensions:
     27       document.createElement('div')['__proto__'] &&
     28       document.createElement('div')['__proto__'] !==
     29         document.createElement('form')['__proto__']
     30   },
     31 
     32   ScriptFragment: '<script[^>]*>([\\S\\s]*?)<\/script>',
     33   JSONFilter: /^\/\*-secure-([\s\S]*)\*\/\s*$/,
     34 
     35   emptyFunction: function() { },
     36   K: function(x) { return x }
     37 };
     38 
     39 if (Prototype.Browser.MobileSafari)
     40   Prototype.BrowserFeatures.SpecificElementExtensions = false;
     41 
     42 
     43 /* Based on Alex Arnell's inheritance implementation. */
     44 var Class = {
     45   create: function() {
     46     var parent = null, properties = $A(arguments);
     47     if (Object.isFunction(properties[0]))
     48       parent = properties.shift();
     49 
     50     function klass() {
     51       this.initialize.apply(this, arguments);
     52     }
     53 
     54     Object.extend(klass, Class.Methods);
     55     klass.superclass = parent;
     56     klass.subclasses = [];
     57 
     58     if (parent) {
     59       var subclass = function() { };
     60       subclass.prototype = parent.prototype;
     61       klass.prototype = new subclass;
     62       parent.subclasses.push(klass);
     63     }
     64 
     65     for (var i = 0; i < properties.length; i++)
     66       klass.addMethods(properties[i]);
     67 
     68     if (!klass.prototype.initialize)
     69       klass.prototype.initialize = Prototype.emptyFunction;
     70 
     71     klass.prototype.constructor = klass;
     72 
     73     return klass;
     74   }
     75 };
     76 
     77 Class.Methods = {
     78   addMethods: function(source) {
     79     var ancestor   = this.superclass && this.superclass.prototype;
     80     var properties = Object.keys(source);
     81 
     82     if (!Object.keys({ toString: true }).length)
     83       properties.push("toString", "valueOf");
     84 
     85     for (var i = 0, length = properties.length; i < length; i++) {
     86       var property = properties[i], value = source[property];
     87       if (ancestor && Object.isFunction(value) &&
     88           value.argumentNames().first() == "$super") {
     89         var method = value;
     90         value = (function(m) {
     91           return function() { return ancestor[m].apply(this, arguments) };
     92         })(property).wrap(method);
     93 
     94         value.valueOf = method.valueOf.bind(method);
     95         value.toString = method.toString.bind(method);
     96       }
     97       this.prototype[property] = value;
     98     }
     99 
    100     return this;
    101   }
    102 };
    103 
    104 var Abstract = { };
    105 
    106 Object.extend = function(destination, source) {
    107   for (var property in source)
    108     destination[property] = source[property];
    109   return destination;
    110 };
    111 
    112 Object.extend(Object, {
    113   inspect: function(object) {
    114     try {
    115       if (Object.isUndefined(object)) return 'undefined';
    116       if (object === null) return 'null';
    117       return object.inspect ? object.inspect() : String(object);
    118     } catch (e) {
    119       if (e instanceof RangeError) return '...';
    120       throw e;
    121     }
    122   },
    123 
    124   toJSON: function(object) {
    125     var type = typeof object;
    126     switch (type) {
    127       case 'undefined':
    128       case 'function':
    129       case 'unknown': return;
    130       case 'boolean': return object.toString();
    131     }
    132 
    133     if (object === null) return 'null';
    134     if (object.toJSON) return object.toJSON();
    135     if (Object.isElement(object)) return;
    136 
    137     var results = [];
    138     for (var property in object) {
    139       var value = Object.toJSON(object[property]);
    140       if (!Object.isUndefined(value))
    141         results.push(property.toJSON() + ': ' + value);
    142     }
    143 
    144     return '{' + results.join(', ') + '}';
    145   },
    146 
    147   toQueryString: function(object) {
    148     return $H(object).toQueryString();
    149   },
    150 
    151   toHTML: function(object) {
    152     return object && object.toHTML ? object.toHTML() : String.interpret(object);
    153   },
    154 
    155   keys: function(object) {
    156     var keys = [];
    157     for (var property in object)
    158       keys.push(property);
    159     return keys;
    160   },
    161 
    162   values: function(object) {
    163     var values = [];
    164     for (var property in object)
    165       values.push(object[property]);
    166     return values;
    167   },
    168 
    169   clone: function(object) {
    170     return Object.extend({ }, object);
    171   },
    172 
    173   isElement: function(object) {
    174     return !!(object && object.nodeType == 1);
    175   },
    176 
    177   isArray: function(object) {
    178     return object != null && typeof object == "object" &&
    179       'splice' in object && 'join' in object;
    180   },
    181 
    182   isHash: function(object) {
    183     return object instanceof Hash;
    184   },
    185 
    186   isFunction: function(object) {
    187     return typeof object == "function";
    188   },
    189 
    190   isString: function(object) {
    191     return typeof object == "string";
    192   },
    193 
    194   isNumber: function(object) {
    195     return typeof object == "number";
    196   },
    197 
    198   isUndefined: function(object) {
    199     return typeof object == "undefined";
    200   }
    201 });
    202 
    203 Object.extend(Function.prototype, {
    204   argumentNames: function() {
    205     var names = this.toString().match(/^[\s\(]*function[^(]*\(([^\)]*)\)/)[1]
    206       .replace(/\s+/g, '').split(',');
    207     return names.length == 1 && !names[0] ? [] : names;
    208   },
    209 
    210   bind: function() {
    211     if (arguments.length < 2 && Object.isUndefined(arguments[0])) return this;
    212     var __method = this, args = $A(arguments), object = args.shift();
    213     return function() {
    214       return __method.apply(object, args.concat($A(arguments)));
    215     }
    216   },
    217 
    218   bindAsEventListener: function() {
    219     var __method = this, args = $A(arguments), object = args.shift();
    220     return function(event) {
    221       return __method.apply(object, [event || window.event].concat(args));
    222     }
    223   },
    224 
    225   curry: function() {
    226     if (!arguments.length) return this;
    227     var __method = this, args = $A(arguments);
    228     return function() {
    229       return __method.apply(this, args.concat($A(arguments)));
    230     }
    231   },
    232 
    233   delay: function() {
    234     var __method = this, args = $A(arguments), timeout = args.shift() * 1000;
    235     return window.setTimeout(function() {
    236       return __method.apply(__method, args);
    237     }, timeout);
    238   },
    239 
    240   defer: function() {
    241     var args = [0.01].concat($A(arguments));
    242     return this.delay.apply(this, args);
    243   },
    244 
    245   wrap: function(wrapper) {
    246     var __method = this;
    247     return function() {
    248       return wrapper.apply(this, [__method.bind(this)].concat($A(arguments)));
    249     }
    250   },
    251 
    252   methodize: function() {
    253     if (this._methodized) return this._methodized;
    254     var __method = this;
    255     return this._methodized = function() {
    256       return __method.apply(null, [this].concat($A(arguments)));
    257     };
    258   }
    259 });
    260 
    261 Date.prototype.toJSON = function() {
    262   return '"' + this.getUTCFullYear() + '-' +
    263     (this.getUTCMonth() + 1).toPaddedString(2) + '-' +
    264     this.getUTCDate().toPaddedString(2) + 'T' +
    265     this.getUTCHours().toPaddedString(2) + ':' +
    266     this.getUTCMinutes().toPaddedString(2) + ':' +
    267     this.getUTCSeconds().toPaddedString(2) + 'Z"';
    268 };
    269 
    270 var Try = {
    271   these: function() {
    272     var returnValue;
    273 
    274     for (var i = 0, length = arguments.length; i < length; i++) {
    275       var lambda = arguments[i];
    276       try {
    277         returnValue = lambda();
    278         break;
    279       } catch (e) { }
    280     }
    281 
    282     return returnValue;
    283   }
    284 };
    285 
    286 RegExp.prototype.match = RegExp.prototype.test;
    287 
    288 RegExp.escape = function(str) {
    289   return String(str).replace(/([.*+?^=!:${}()|[\]\/\\])/g, '\\$1');
    290 };
    291 
    292 /*--------------------------------------------------------------------------*/
    293 
    294 var PeriodicalExecuter = Class.create({
    295   initialize: function(callback, frequency) {
    296     this.callback = callback;
    297     this.frequency = frequency;
    298     this.currentlyExecuting = false;
    299 
    300     this.registerCallback();
    301   },
    302 
    303   registerCallback: function() {
    304     this.timer = setInterval(this.onTimerEvent.bind(this), this.frequency * 1000);
    305   },
    306 
    307   execute: function() {
    308     this.callback(this);
    309   },
    310 
    311   stop: function() {
    312     if (!this.timer) return;
    313     clearInterval(this.timer);
    314     this.timer = null;
    315   },
    316 
    317   onTimerEvent: function() {
    318     if (!this.currentlyExecuting) {
    319       try {
    320         this.currentlyExecuting = true;
    321         this.execute();
    322       } finally {
    323         this.currentlyExecuting = false;
    324       }
    325     }
    326   }
    327 });
    328 Object.extend(String, {
    329   interpret: function(value) {
    330     return value == null ? '' : String(value);
    331   },
    332   specialChar: {
    333     '\b': '\\b',
    334     '\t': '\\t',
    335     '\n': '\\n',
    336     '\f': '\\f',
    337     '\r': '\\r',
    338     '\\': '\\\\'
    339   }
    340 });
    341 
    342 Object.extend(String.prototype, {
    343   gsub: function(pattern, replacement) {
    344     var result = '', source = this, match;
    345     replacement = arguments.callee.prepareReplacement(replacement);
    346 
    347     while (source.length > 0) {
    348       if (match = source.match(pattern)) {
    349         result += source.slice(0, match.index);
    350         result += String.interpret(replacement(match));
    351         source  = source.slice(match.index + match[0].length);
    352       } else {
    353         result += source, source = '';
    354       }
    355     }
    356     return result;
    357   },
    358 
    359   sub: function(pattern, replacement, count) {
    360     replacement = this.gsub.prepareReplacement(replacement);
    361     count = Object.isUndefined(count) ? 1 : count;
    362 
    363     return this.gsub(pattern, function(match) {
    364       if (--count < 0) return match[0];
    365       return replacement(match);
    366     });
    367   },
    368 
    369   scan: function(pattern, iterator) {
    370     this.gsub(pattern, iterator);
    371     return String(this);
    372   },
    373 
    374   truncate: function(length, truncation) {
    375     length = length || 30;
    376     truncation = Object.isUndefined(truncation) ? '...' : truncation;
    377     return this.length > length ?
    378       this.slice(0, length - truncation.length) + truncation : String(this);
    379   },
    380 
    381   strip: function() {
    382     return this.replace(/^\s+/, '').replace(/\s+$/, '');
    383   },
    384 
    385   stripTags: function() {
    386     return this.replace(/<\/?[^>]+>/gi, '');
    387   },
    388 
    389   stripScripts: function() {
    390     return this.replace(new RegExp(Prototype.ScriptFragment, 'img'), '');
    391   },
    392 
    393   extractScripts: function() {
    394     var matchAll = new RegExp(Prototype.ScriptFragment, 'img');
    395     var matchOne = new RegExp(Prototype.ScriptFragment, 'im');
    396     return (this.match(matchAll) || []).map(function(scriptTag) {
    397       return (scriptTag.match(matchOne) || ['', ''])[1];
    398     });
    399   },
    400 
    401   evalScripts: function() {
    402     return this.extractScripts().map(function(script) { return eval(script) });
    403   },
    404 
    405   escapeHTML: function() {
    406     var self = arguments.callee;
    407     self.text.data = this;
    408     return self.div.innerHTML;
    409   },
    410 
    411   unescapeHTML: function() {
    412     var div = new Element('div');
    413     div.innerHTML = this.stripTags();
    414     return div.childNodes[0] ? (div.childNodes.length > 1 ?
    415       $A(div.childNodes).inject('', function(memo, node) { return memo+node.nodeValue }) :
    416       div.childNodes[0].nodeValue) : '';
    417   },
    418 
    419   toQueryParams: function(separator) {
    420     var match = this.strip().match(/([^?#]*)(#.*)?$/);
    421     if (!match) return { };
    422 
    423     return match[1].split(separator || '&').inject({ }, function(hash, pair) {
    424       if ((pair = pair.split('='))[0]) {
    425         var key = decodeURIComponent(pair.shift());
    426         var value = pair.length > 1 ? pair.join('=') : pair[0];
    427         if (value != undefined) value = decodeURIComponent(value);
    428 
    429         if (key in hash) {
    430           if (!Object.isArray(hash[key])) hash[key] = [hash[key]];
    431           hash[key].push(value);
    432         }
    433         else hash[key] = value;
    434       }
    435       return hash;
    436     });
    437   },
    438 
    439   toArray: function() {
    440     return this.split('');
    441   },
    442 
    443   succ: function() {
    444     return this.slice(0, this.length - 1) +
    445       String.fromCharCode(this.charCodeAt(this.length - 1) + 1);
    446   },
    447 
    448   times: function(count) {
    449     return count < 1 ? '' : new Array(count + 1).join(this);
    450   },
    451 
    452   camelize: function() {
    453     var parts = this.split('-'), len = parts.length;
    454     if (len == 1) return parts[0];
    455 
    456     var camelized = this.charAt(0) == '-'
    457       ? parts[0].charAt(0).toUpperCase() + parts[0].substring(1)
    458       : parts[0];
    459 
    460     for (var i = 1; i < len; i++)
    461       camelized += parts[i].charAt(0).toUpperCase() + parts[i].substring(1);
    462 
    463     return camelized;
    464   },
    465 
    466   capitalize: function() {
    467     return this.charAt(0).toUpperCase() + this.substring(1).toLowerCase();
    468   },
    469 
    470   underscore: function() {
    471     return this.gsub(/::/, '/').gsub(/([A-Z]+)([A-Z][a-z])/,'#{1}_#{2}').gsub(/([a-z\d])([A-Z])/,'#{1}_#{2}').gsub(/-/,'_').toLowerCase();
    472   },
    473 
    474   dasherize: function() {
    475     return this.gsub(/_/,'-');
    476   },
    477 
    478   inspect: function(useDoubleQuotes) {
    479     var escapedString = this.gsub(/[\x00-\x1f\\]/, function(match) {
    480       var character = String.specialChar[match[0]];
    481       return character ? character : '\\u00' + match[0].charCodeAt().toPaddedString(2, 16);
    482     });
    483     if (useDoubleQuotes) return '"' + escapedString.replace(/"/g, '\\"') + '"';
    484     return "'" + escapedString.replace(/'/g, '\\\'') + "'";
    485   },
    486 
    487   toJSON: function() {
    488     return this.inspect(true);
    489   },
    490 
    491   unfilterJSON: function(filter) {
    492     return this.sub(filter || Prototype.JSONFilter, '#{1}');
    493   },
    494 
    495   isJSON: function() {
    496     var str = this;
    497     if (str.blank()) return false;
    498     str = this.replace(/\\./g, '@').replace(/"[^"\\\n\r]*"/g, '');
    499     return (/^[,:{}\[\]0-9.\-+Eaeflnr-u \n\r\t]*$/).test(str);
    500   },
    501 
    502   evalJSON: function(sanitize) {
    503     var json = this.unfilterJSON();
    504     try {
    505       if (!sanitize || json.isJSON()) return eval('(' + json + ')');
    506     } catch (e) { }
    507     throw new SyntaxError('Badly formed JSON string: ' + this.inspect());
    508   },
    509 
    510   include: function(pattern) {
    511     return this.indexOf(pattern) > -1;
    512   },
    513 
    514   startsWith: function(pattern) {
    515     return this.indexOf(pattern) === 0;
    516   },
    517 
    518   endsWith: function(pattern) {
    519     var d = this.length - pattern.length;
    520     return d >= 0 && this.lastIndexOf(pattern) === d;
    521   },
    522 
    523   empty: function() {
    524     return this == '';
    525   },
    526 
    527   blank: function() {
    528     return /^\s*$/.test(this);
    529   },
    530 
    531   interpolate: function(object, pattern) {
    532     return new Template(this, pattern).evaluate(object);
    533   }
    534 });
    535 
    536 if (Prototype.Browser.WebKit || Prototype.Browser.IE) Object.extend(String.prototype, {
    537   escapeHTML: function() {
    538     return this.replace(/&/g,'&amp;').replace(/</g,'&lt;').replace(/>/g,'&gt;');
    539   },
    540   unescapeHTML: function() {
    541     return this.stripTags().replace(/&amp;/g,'&').replace(/&lt;/g,'<').replace(/&gt;/g,'>');
    542   }
    543 });
    544 
    545 String.prototype.gsub.prepareReplacement = function(replacement) {
    546   if (Object.isFunction(replacement)) return replacement;
    547   var template = new Template(replacement);
    548   return function(match) { return template.evaluate(match) };
    549 };
    550 
    551 String.prototype.parseQuery = String.prototype.toQueryParams;
    552 
    553 Object.extend(String.prototype.escapeHTML, {
    554   div:  document.createElement('div'),
    555   text: document.createTextNode('')
    556 });
    557 
    558 String.prototype.escapeHTML.div.appendChild(String.prototype.escapeHTML.text);
    559 
    560 var Template = Class.create({
    561   initialize: function(template, pattern) {
    562     this.template = template.toString();
    563     this.pattern = pattern || Template.Pattern;
    564   },
    565 
    566   evaluate: function(object) {
    567     if (Object.isFunction(object.toTemplateReplacements))
    568       object = object.toTemplateReplacements();
    569 
    570     return this.template.gsub(this.pattern, function(match) {
    571       if (object == null) return '';
    572 
    573       var before = match[1] || '';
    574       if (before == '\\') return match[2];
    575 
    576       var ctx = object, expr = match[3];
    577       var pattern = /^([^.[]+|\[((?:.*?[^\\])?)\])(\.|\[|$)/;
    578       match = pattern.exec(expr);
    579       if (match == null) return before;
    580 
    581       while (match != null) {
    582         var comp = match[1].startsWith('[') ? match[2].gsub('\\\\]', ']') : match[1];
    583         ctx = ctx[comp];
    584         if (null == ctx || '' == match[3]) break;
    585         expr = expr.substring('[' == match[3] ? match[1].length : match[0].length);
    586         match = pattern.exec(expr);
    587       }
    588 
    589       return before + String.interpret(ctx);
    590     });
    591   }
    592 });
    593 Template.Pattern = /(^|.|\r|\n)(#\{(.*?)\})/;
    594 
    595 var $break = { };
    596 
    597 var Enumerable = {
    598   each: function(iterator, context) {
    599     var index = 0;
    600     try {
    601       this._each(function(value) {
    602         iterator.call(context, value, index++);
    603       });
    604     } catch (e) {
    605       if (e != $break) throw e;
    606     }
    607     return this;
    608   },
    609 
    610   eachSlice: function(number, iterator, context) {
    611     var index = -number, slices = [], array = this.toArray();
    612     if (number < 1) return array;
    613     while ((index += number) < array.length)
    614       slices.push(array.slice(index, index+number));
    615     return slices.collect(iterator, context);
    616   },
    617 
    618   all: function(iterator, context) {
    619     iterator = iterator || Prototype.K;
    620     var result = true;
    621     this.each(function(value, index) {
    622       result = result && !!iterator.call(context, value, index);
    623       if (!result) throw $break;
    624     });
    625     return result;
    626   },
    627 
    628   any: function(iterator, context) {
    629     iterator = iterator || Prototype.K;
    630     var result = false;
    631     this.each(function(value, index) {
    632       if (result = !!iterator.call(context, value, index))
    633         throw $break;
    634     });
    635     return result;
    636   },
    637 
    638   collect: function(iterator, context) {
    639     iterator = iterator || Prototype.K;
    640     var results = [];
    641     this.each(function(value, index) {
    642       results.push(iterator.call(context, value, index));
    643     });
    644     return results;
    645   },
    646 
    647   detect: function(iterator, context) {
    648     var result;
    649     this.each(function(value, index) {
    650       if (iterator.call(context, value, index)) {
    651         result = value;
    652         throw $break;
    653       }
    654     });
    655     return result;
    656   },
    657 
    658   findAll: function(iterator, context) {
    659     var results = [];
    660     this.each(function(value, index) {
    661       if (iterator.call(context, value, index))
    662         results.push(value);
    663     });
    664     return results;
    665   },
    666 
    667   grep: function(filter, iterator, context) {
    668     iterator = iterator || Prototype.K;
    669     var results = [];
    670 
    671     if (Object.isString(filter))
    672       filter = new RegExp(filter);
    673 
    674     this.each(function(value, index) {
    675       if (filter.match(value))
    676         results.push(iterator.call(context, value, index));
    677     });
    678     return results;
    679   },
    680 
    681   include: function(object) {
    682     if (Object.isFunction(this.indexOf))
    683       if (this.indexOf(object) != -1) return true;
    684 
    685     var found = false;
    686     this.each(function(value) {
    687       if (value == object) {
    688         found = true;
    689         throw $break;
    690       }
    691     });
    692     return found;
    693   },
    694 
    695   inGroupsOf: function(number, fillWith) {
    696     fillWith = Object.isUndefined(fillWith) ? null : fillWith;
    697     return this.eachSlice(number, function(slice) {
    698       while(slice.length < number) slice.push(fillWith);
    699       return slice;
    700     });
    701   },
    702 
    703   inject: function(memo, iterator, context) {
    704     this.each(function(value, index) {
    705       memo = iterator.call(context, memo, value, index);
    706     });
    707     return memo;
    708   },
    709 
    710   invoke: function(method) {
    711     var args = $A(arguments).slice(1);
    712     return this.map(function(value) {
    713       return value[method].apply(value, args);
    714     });
    715   },
    716 
    717   max: function(iterator, context) {
    718     iterator = iterator || Prototype.K;
    719     var result;
    720     this.each(function(value, index) {
    721       value = iterator.call(context, value, index);
    722       if (result == null || value >= result)
    723         result = value;
    724     });
    725     return result;
    726   },
    727 
    728   min: function(iterator, context) {
    729     iterator = iterator || Prototype.K;
    730     var result;
    731     this.each(function(value, index) {
    732       value = iterator.call(context, value, index);
    733       if (result == null || value < result)
    734         result = value;
    735     });
    736     return result;
    737   },
    738 
    739   partition: function(iterator, context) {
    740     iterator = iterator || Prototype.K;
    741     var trues = [], falses = [];
    742     this.each(function(value, index) {
    743       (iterator.call(context, value, index) ?
    744         trues : falses).push(value);
    745     });
    746     return [trues, falses];
    747   },
    748 
    749   pluck: function(property) {
    750     var results = [];
    751     this.each(function(value) {
    752       results.push(value[property]);
    753     });
    754     return results;
    755   },
    756 
    757   reject: function(iterator, context) {
    758     var results = [];
    759     this.each(function(value, index) {
    760       if (!iterator.call(context, value, index))
    761         results.push(value);
    762     });
    763     return results;
    764   },
    765 
    766   sortBy: function(iterator, context) {
    767     return this.map(function(value, index) {
    768       return {
    769         value: value,
    770         criteria: iterator.call(context, value, index)
    771       };
    772     }).sort(function(left, right) {
    773       var a = left.criteria, b = right.criteria;
    774       return a < b ? -1 : a > b ? 1 : 0;
    775     }).pluck('value');
    776   },
    777 
    778   toArray: function() {
    779     return this.map();
    780   },
    781 
    782   zip: function() {
    783     var iterator = Prototype.K, args = $A(arguments);
    784     if (Object.isFunction(args.last()))
    785       iterator = args.pop();
    786 
    787     var collections = [this].concat(args).map($A);
    788     return this.map(function(value, index) {
    789       return iterator(collections.pluck(index));
    790     });
    791   },
    792 
    793   size: function() {
    794     return this.toArray().length;
    795   },
    796 
    797   inspect: function() {
    798     return '#<Enumerable:' + this.toArray().inspect() + '>';
    799   }
    800 };
    801 
    802 Object.extend(Enumerable, {
    803   map:     Enumerable.collect,
    804   find:    Enumerable.detect,
    805   select:  Enumerable.findAll,
    806   filter:  Enumerable.findAll,
    807   member:  Enumerable.include,
    808   entries: Enumerable.toArray,
    809   every:   Enumerable.all,
    810   some:    Enumerable.any
    811 });
    812 function $A(iterable) {
    813   if (!iterable) return [];
    814   if (iterable.toArray) return iterable.toArray();
    815   var length = iterable.length || 0, results = new Array(length);
    816   while (length--) results[length] = iterable[length];
    817   return results;
    818 }
    819 
    820 if (Prototype.Browser.WebKit) {
    821   $A = function(iterable) {
    822     if (!iterable) return [];
    823     // In Safari, only use the `toArray` method if it's not a NodeList.
    824     // A NodeList is a function, has an function `item` property, and a numeric
    825     // `length` property. Adapted from Google Doctype.
    826     if (!(typeof iterable === 'function' && typeof iterable.length ===
    827         'number' && typeof iterable.item === 'function') && iterable.toArray)
    828       return iterable.toArray();
    829     var length = iterable.length || 0, results = new Array(length);
    830     while (length--) results[length] = iterable[length];
    831     return results;
    832   };
    833 }
    834 
    835 Array.from = $A;
    836 
    837 Object.extend(Array.prototype, Enumerable);
    838 
    839 if (!Array.prototype._reverse) Array.prototype._reverse = Array.prototype.reverse;
    840 
    841 Object.extend(Array.prototype, {
    842   _each: function(iterator) {
    843     for (var i = 0, length = this.length; i < length; i++)
    844       iterator(this[i]);
    845   },
    846 
    847   clear: function() {
    848     this.length = 0;
    849     return this;
    850   },
    851 
    852   first: function() {
    853     return this[0];
    854   },
    855 
    856   last: function() {
    857     return this[this.length - 1];
    858   },
    859 
    860   compact: function() {
    861     return this.select(function(value) {
    862       return value != null;
    863     });
    864   },
    865 
    866   flatten: function() {
    867     return this.inject([], function(array, value) {
    868       return array.concat(Object.isArray(value) ?
    869         value.flatten() : [value]);
    870     });
    871   },
    872 
    873   without: function() {
    874     var values = $A(arguments);
    875     return this.select(function(value) {
    876       return !values.include(value);
    877     });
    878   },
    879 
    880   reverse: function(inline) {
    881     return (inline !== false ? this : this.toArray())._reverse();
    882   },
    883 
    884   reduce: function() {
    885     return this.length > 1 ? this : this[0];
    886   },
    887 
    888   uniq: function(sorted) {
    889     return this.inject([], function(array, value, index) {
    890       if (0 == index || (sorted ? array.last() != value : !array.include(value)))
    891         array.push(value);
    892       return array;
    893     });
    894   },
    895 
    896   intersect: function(array) {
    897     return this.uniq().findAll(function(item) {
    898       return array.detect(function(value) { return item === value });
    899     });
    900   },
    901 
    902   clone: function() {
    903     return [].concat(this);
    904   },
    905 
    906   size: function() {
    907     return this.length;
    908   },
    909 
    910   inspect: function() {
    911     return '[' + this.map(Object.inspect).join(', ') + ']';
    912   },
    913 
    914   toJSON: function() {
    915     var results = [];
    916     this.each(function(object) {
    917       var value = Object.toJSON(object);
    918       if (!Object.isUndefined(value)) results.push(value);
    919     });
    920     return '[' + results.join(', ') + ']';
    921   }
    922 });
    923 
    924 // use native browser JS 1.6 implementation if available
    925 if (Object.isFunction(Array.prototype.forEach))
    926   Array.prototype._each = Array.prototype.forEach;
    927 
    928 if (!Array.prototype.indexOf) Array.prototype.indexOf = function(item, i) {
    929   i || (i = 0);
    930   var length = this.length;
    931   if (i < 0) i = length + i;
    932   for (; i < length; i++)
    933     if (this[i] === item) return i;
    934   return -1;
    935 };
    936 
    937 if (!Array.prototype.lastIndexOf) Array.prototype.lastIndexOf = function(item, i) {
    938   i = isNaN(i) ? this.length : (i < 0 ? this.length + i : i) + 1;
    939   var n = this.slice(0, i).reverse().indexOf(item);
    940   return (n < 0) ? n : i - n - 1;
    941 };
    942 
    943 Array.prototype.toArray = Array.prototype.clone;
    944 
    945 function $w(string) {
    946   if (!Object.isString(string)) return [];
    947   string = string.strip();
    948   return string ? string.split(/\s+/) : [];
    949 }
    950 
    951 if (Prototype.Browser.Opera){
    952   Array.prototype.concat = function() {
    953     var array = [];
    954     for (var i = 0, length = this.length; i < length; i++) array.push(this[i]);
    955     for (var i = 0, length = arguments.length; i < length; i++) {
    956       if (Object.isArray(arguments[i])) {
    957         for (var j = 0, arrayLength = arguments[i].length; j < arrayLength; j++)
    958           array.push(arguments[i][j]);
    959       } else {
    960         array.push(arguments[i]);
    961       }
    962     }
    963     return array;
    964   };
    965 }
    966 Object.extend(Number.prototype, {
    967   toColorPart: function() {
    968     return this.toPaddedString(2, 16);
    969   },
    970 
    971   succ: function() {
    972     return this + 1;
    973   },
    974 
    975   times: function(iterator, context) {
    976     $R(0, this, true).each(iterator, context);
    977     return this;
    978   },
    979 
    980   toPaddedString: function(length, radix) {
    981     var string = this.toString(radix || 10);
    982     return '0'.times(length - string.length) + string;
    983   },
    984 
    985   toJSON: function() {
    986     return isFinite(this) ? this.toString() : 'null';
    987   }
    988 });
    989 
    990 $w('abs round ceil floor').each(function(method){
    991   Number.prototype[method] = Math[method].methodize();
    992 });
    993 function $H(object) {
    994   return new Hash(object);
    995 };
    996 
    997 var Hash = Class.create(Enumerable, (function() {
    998 
    999   function toQueryPair(key, value) {
   1000     if (Object.isUndefined(value)) return key;
   1001     return key + '=' + encodeURIComponent(String.interpret(value));
   1002   }
   1003 
   1004   return {
   1005     initialize: function(object) {
   1006       this._object = Object.isHash(object) ? object.toObject() : Object.clone(object);
   1007     },
   1008 
   1009     _each: function(iterator) {
   1010       for (var key in this._object) {
   1011         var value = this._object[key], pair = [key, value];
   1012         pair.key = key;
   1013         pair.value = value;
   1014         iterator(pair);
   1015       }
   1016     },
   1017 
   1018     set: function(key, value) {
   1019       return this._object[key] = value;
   1020     },
   1021 
   1022     get: function(key) {
   1023       // simulating poorly supported hasOwnProperty
   1024       if (this._object[key] !== Object.prototype[key])
   1025         return this._object[key];
   1026     },
   1027 
   1028     unset: function(key) {
   1029       var value = this._object[key];
   1030       delete this._object[key];
   1031       return value;
   1032     },
   1033 
   1034     toObject: function() {
   1035       return Object.clone(this._object);
   1036     },
   1037 
   1038     keys: function() {
   1039       return this.pluck('key');
   1040     },
   1041 
   1042     values: function() {
   1043       return this.pluck('value');
   1044     },
   1045 
   1046     index: function(value) {
   1047       var match = this.detect(function(pair) {
   1048         return pair.value === value;
   1049       });
   1050       return match && match.key;
   1051     },
   1052 
   1053     merge: function(object) {
   1054       return this.clone().update(object);
   1055     },
   1056 
   1057     update: function(object) {
   1058       return new Hash(object).inject(this, function(result, pair) {
   1059         result.set(pair.key, pair.value);
   1060         return result;
   1061       });
   1062     },
   1063 
   1064     toQueryString: function() {
   1065       return this.inject([], function(results, pair) {
   1066         var key = encodeURIComponent(pair.key), values = pair.value;
   1067 
   1068         if (values && typeof values == 'object') {
   1069           if (Object.isArray(values))
   1070             return results.concat(values.map(toQueryPair.curry(key)));
   1071         } else results.push(toQueryPair(key, values));
   1072         return results;
   1073       }).join('&');
   1074     },
   1075 
   1076     inspect: function() {
   1077       return '#<Hash:{' + this.map(function(pair) {
   1078         return pair.map(Object.inspect).join(': ');
   1079       }).join(', ') + '}>';
   1080     },
   1081 
   1082     toJSON: function() {
   1083       return Object.toJSON(this.toObject());
   1084     },
   1085 
   1086     clone: function() {
   1087       return new Hash(this);
   1088     }
   1089   }
   1090 })());
   1091 
   1092 Hash.prototype.toTemplateReplacements = Hash.prototype.toObject;
   1093 Hash.from = $H;
   1094 var ObjectRange = Class.create(Enumerable, {
   1095   initialize: function(start, end, exclusive) {
   1096     this.start = start;
   1097     this.end = end;
   1098     this.exclusive = exclusive;
   1099   },
   1100 
   1101   _each: function(iterator) {
   1102     var value = this.start;
   1103     while (this.include(value)) {
   1104       iterator(value);
   1105       value = value.succ();
   1106     }
   1107   },
   1108 
   1109   include: function(value) {
   1110     if (value < this.start)
   1111       return false;
   1112     if (this.exclusive)
   1113       return value < this.end;
   1114     return value <= this.end;
   1115   }
   1116 });
   1117 
   1118 var $R = function(start, end, exclusive) {
   1119   return new ObjectRange(start, end, exclusive);
   1120 };
   1121 
   1122 var Ajax = {
   1123   getTransport: function() {
   1124     return Try.these(
   1125       function() {return new XMLHttpRequest()},
   1126       function() {return new ActiveXObject('Msxml2.XMLHTTP')},
   1127       function() {return new ActiveXObject('Microsoft.XMLHTTP')}
   1128     ) || false;
   1129   },
   1130 
   1131   activeRequestCount: 0
   1132 };
   1133 
   1134 Ajax.Responders = {
   1135   responders: [],
   1136 
   1137   _each: function(iterator) {
   1138     this.responders._each(iterator);
   1139   },
   1140 
   1141   register: function(responder) {
   1142     if (!this.include(responder))
   1143       this.responders.push(responder);
   1144   },
   1145 
   1146   unregister: function(responder) {
   1147     this.responders = this.responders.without(responder);
   1148   },
   1149 
   1150   dispatch: function(callback, request, transport, json) {
   1151     this.each(function(responder) {
   1152       if (Object.isFunction(responder[callback])) {
   1153         try {
   1154           responder[callback].apply(responder, [request, transport, json]);
   1155         } catch (e) { }
   1156       }
   1157     });
   1158   }
   1159 };
   1160 
   1161 Object.extend(Ajax.Responders, Enumerable);
   1162 
   1163 Ajax.Responders.register({
   1164   onCreate:   function() { Ajax.activeRequestCount++ },
   1165   onComplete: function() { Ajax.activeRequestCount-- }
   1166 });
   1167 
   1168 Ajax.Base = Class.create({
   1169   initialize: function(options) {
   1170     this.options = {
   1171       method:       'post',
   1172       asynchronous: true,
   1173       contentType:  'application/x-www-form-urlencoded',
   1174       encoding:     'UTF-8',
   1175       parameters:   '',
   1176       evalJSON:     true,
   1177       evalJS:       true
   1178     };
   1179     Object.extend(this.options, options || { });
   1180 
   1181     this.options.method = this.options.method.toLowerCase();
   1182 
   1183     if (Object.isString(this.options.parameters))
   1184       this.options.parameters = this.options.parameters.toQueryParams();
   1185     else if (Object.isHash(this.options.parameters))
   1186       this.options.parameters = this.options.parameters.toObject();
   1187   }
   1188 });
   1189 
   1190 Ajax.Request = Class.create(Ajax.Base, {
   1191   _complete: false,
   1192 
   1193   initialize: function($super, url, options) {
   1194     $super(options);
   1195     this.transport = Ajax.getTransport();
   1196     this.request(url);
   1197   },
   1198 
   1199   request: function(url) {
   1200     this.url = url;
   1201     this.method = this.options.method;
   1202     var params = Object.clone(this.options.parameters);
   1203 
   1204     if (!['get', 'post'].include(this.method)) {
   1205       // simulate other verbs over post
   1206       params['_method'] = this.method;
   1207       this.method = 'post';
   1208     }
   1209 
   1210     this.parameters = params;
   1211 
   1212     if (params = Object.toQueryString(params)) {
   1213       // when GET, append parameters to URL
   1214       if (this.method == 'get')
   1215         this.url += (this.url.include('?') ? '&' : '?') + params;
   1216       else if (/Konqueror|Safari|KHTML/.test(navigator.userAgent))
   1217         params += '&_=';
   1218     }
   1219 
   1220     try {
   1221       var response = new Ajax.Response(this);
   1222       if (this.options.onCreate) this.options.onCreate(response);
   1223       Ajax.Responders.dispatch('onCreate', this, response);
   1224 
   1225       this.transport.open(this.method.toUpperCase(), this.url,
   1226         this.options.asynchronous);
   1227 
   1228       if (this.options.asynchronous) this.respondToReadyState.bind(this).defer(1);
   1229 
   1230       this.transport.onreadystatechange = this.onStateChange.bind(this);
   1231       this.setRequestHeaders();
   1232 
   1233       this.body = this.method == 'post' ? (this.options.postBody || params) : null;
   1234       this.transport.send(this.body);
   1235 
   1236       /* Force Firefox to handle ready state 4 for synchronous requests */
   1237       if (!this.options.asynchronous && this.transport.overrideMimeType)
   1238         this.onStateChange();
   1239 
   1240     }
   1241     catch (e) {
   1242       this.dispatchException(e);
   1243     }
   1244   },
   1245 
   1246   onStateChange: function() {
   1247     var readyState = this.transport.readyState;
   1248     if (readyState > 1 && !((readyState == 4) && this._complete))
   1249       this.respondToReadyState(this.transport.readyState);
   1250   },
   1251 
   1252   setRequestHeaders: function() {
   1253     var headers = {
   1254       'X-Requested-With': 'XMLHttpRequest',
   1255       'X-Prototype-Version': Prototype.Version,
   1256       'Accept': 'text/javascript, text/html, application/xml, text/xml, */*'
   1257     };
   1258 
   1259     if (this.method == 'post') {
   1260       headers['Content-type'] = this.options.contentType +
   1261         (this.options.encoding ? '; charset=' + this.options.encoding : '');
   1262 
   1263       /* Force "Connection: close" for older Mozilla browsers to work
   1264        * around a bug where XMLHttpRequest sends an incorrect
   1265        * Content-length header. See Mozilla Bugzilla #246651.
   1266        */
   1267       if (this.transport.overrideMimeType &&
   1268           (navigator.userAgent.match(/Gecko\/(\d{4})/) || [0,2005])[1] < 2005)
   1269             headers['Connection'] = 'close';
   1270     }
   1271 
   1272     // user-defined headers
   1273     if (typeof this.options.requestHeaders == 'object') {
   1274       var extras = this.options.requestHeaders;
   1275 
   1276       if (Object.isFunction(extras.push))
   1277         for (var i = 0, length = extras.length; i < length; i += 2)
   1278           headers[extras[i]] = extras[i+1];
   1279       else
   1280         $H(extras).each(function(pair) { headers[pair.key] = pair.value });
   1281     }
   1282 
   1283     for (var name in headers)
   1284       this.transport.setRequestHeader(name, headers[name]);
   1285   },
   1286 
   1287   success: function() {
   1288     var status = this.getStatus();
   1289     return !status || (status >= 200 && status < 300);
   1290   },
   1291 
   1292   getStatus: function() {
   1293     try {
   1294       return this.transport.status || 0;
   1295     } catch (e) { return 0 }
   1296   },
   1297 
   1298   respondToReadyState: function(readyState) {
   1299     var state = Ajax.Request.Events[readyState], response = new Ajax.Response(this);
   1300 
   1301     if (state == 'Complete') {
   1302       try {
   1303         this._complete = true;
   1304         (this.options['on' + response.status]
   1305          || this.options['on' + (this.success() ? 'Success' : 'Failure')]
   1306          || Prototype.emptyFunction)(response, response.headerJSON);
   1307       } catch (e) {
   1308         this.dispatchException(e);
   1309       }
   1310 
   1311       var contentType = response.getHeader('Content-type');
   1312       if (this.options.evalJS == 'force'
   1313           || (this.options.evalJS && this.isSameOrigin() && contentType
   1314           && contentType.match(/^\s*(text|application)\/(x-)?(java|ecma)script(;.*)?\s*$/i)))
   1315         this.evalResponse();
   1316     }
   1317 
   1318     try {
   1319       (this.options['on' + state] || Prototype.emptyFunction)(response, response.headerJSON);
   1320       Ajax.Responders.dispatch('on' + state, this, response, response.headerJSON);
   1321     } catch (e) {
   1322       this.dispatchException(e);
   1323     }
   1324 
   1325     if (state == 'Complete') {
   1326       // avoid memory leak in MSIE: clean up
   1327       this.transport.onreadystatechange = Prototype.emptyFunction;
   1328     }
   1329   },
   1330 
   1331   isSameOrigin: function() {
   1332     var m = this.url.match(/^\s*https?:\/\/[^\/]*/);
   1333     return !m || (m[0] == '#{protocol}//#{domain}#{port}'.interpolate({
   1334       protocol: location.protocol,
   1335       domain: document.domain,
   1336       port: location.port ? ':' + location.port : ''
   1337     }));
   1338   },
   1339 
   1340   getHeader: function(name) {
   1341     try {
   1342       return this.transport.getResponseHeader(name) || null;
   1343     } catch (e) { return null }
   1344   },
   1345 
   1346   evalResponse: function() {
   1347     try {
   1348       return eval((this.transport.responseText || '').unfilterJSON());
   1349     } catch (e) {
   1350       this.dispatchException(e);
   1351     }
   1352   },
   1353 
   1354   dispatchException: function(exception) {
   1355     (this.options.onException || Prototype.emptyFunction)(this, exception);
   1356     Ajax.Responders.dispatch('onException', this, exception);
   1357   }
   1358 });
   1359 
   1360 Ajax.Request.Events =
   1361   ['Uninitialized', 'Loading', 'Loaded', 'Interactive', 'Complete'];
   1362 
   1363 Ajax.Response = Class.create({
   1364   initialize: function(request){
   1365     this.request = request;
   1366     var transport  = this.transport  = request.transport,
   1367         readyState = this.readyState = transport.readyState;
   1368 
   1369     if((readyState > 2 && !Prototype.Browser.IE) || readyState == 4) {
   1370       this.status       = this.getStatus();
   1371       this.statusText   = this.getStatusText();
   1372       this.responseText = String.interpret(transport.responseText);
   1373       this.headerJSON   = this._getHeaderJSON();
   1374     }
   1375 
   1376     if(readyState == 4) {
   1377       var xml = transport.responseXML;
   1378       this.responseXML  = Object.isUndefined(xml) ? null : xml;
   1379       this.responseJSON = this._getResponseJSON();
   1380     }
   1381   },
   1382 
   1383   status:      0,
   1384   statusText: '',
   1385 
   1386   getStatus: Ajax.Request.prototype.getStatus,
   1387 
   1388   getStatusText: function() {
   1389     try {
   1390       return this.transport.statusText || '';
   1391     } catch (e) { return '' }
   1392   },
   1393 
   1394   getHeader: Ajax.Request.prototype.getHeader,
   1395 
   1396   getAllHeaders: function() {
   1397     try {
   1398       return this.getAllResponseHeaders();
   1399     } catch (e) { return null }
   1400   },
   1401 
   1402   getResponseHeader: function(name) {
   1403     return this.transport.getResponseHeader(name);
   1404   },
   1405 
   1406   getAllResponseHeaders: function() {
   1407     return this.transport.getAllResponseHeaders();
   1408   },
   1409 
   1410   _getHeaderJSON: function() {
   1411     var json = this.getHeader('X-JSON');
   1412     if (!json) return null;
   1413     json = decodeURIComponent(escape(json));
   1414     try {
   1415       return json.evalJSON(this.request.options.sanitizeJSON ||
   1416         !this.request.isSameOrigin());
   1417     } catch (e) {
   1418       this.request.dispatchException(e);
   1419     }
   1420   },
   1421 
   1422   _getResponseJSON: function() {
   1423     var options = this.request.options;
   1424     if (!options.evalJSON || (options.evalJSON != 'force' &&
   1425       !(this.getHeader('Content-type') || '').include('application/json')) ||
   1426         this.responseText.blank())
   1427           return null;
   1428     try {
   1429       return this.responseText.evalJSON(options.sanitizeJSON ||
   1430         !this.request.isSameOrigin());
   1431     } catch (e) {
   1432       this.request.dispatchException(e);
   1433     }
   1434   }
   1435 });
   1436 
   1437 Ajax.Updater = Class.create(Ajax.Request, {
   1438   initialize: function($super, container, url, options) {
   1439     this.container = {
   1440       success: (container.success || container),
   1441       failure: (container.failure || (container.success ? null : container))
   1442     };
   1443 
   1444     options = Object.clone(options);
   1445     var onComplete = options.onComplete;
   1446     options.onComplete = (function(response, json) {
   1447       this.updateContent(response.responseText);
   1448       if (Object.isFunction(onComplete)) onComplete(response, json);
   1449     }).bind(this);
   1450 
   1451     $super(url, options);
   1452   },
   1453 
   1454   updateContent: function(responseText) {
   1455     var receiver = this.container[this.success() ? 'success' : 'failure'],
   1456         options = this.options;
   1457 
   1458     if (!options.evalScripts) responseText = responseText.stripScripts();
   1459 
   1460     if (receiver = $(receiver)) {
   1461       if (options.insertion) {
   1462         if (Object.isString(options.insertion)) {
   1463           var insertion = { }; insertion[options.insertion] = responseText;
   1464           receiver.insert(insertion);
   1465         }
   1466         else options.insertion(receiver, responseText);
   1467       }
   1468       else receiver.update(responseText);
   1469     }
   1470   }
   1471 });
   1472 
   1473 Ajax.PeriodicalUpdater = Class.create(Ajax.Base, {
   1474   initialize: function($super, container, url, options) {
   1475     $super(options);
   1476     this.onComplete = this.options.onComplete;
   1477 
   1478     this.frequency = (this.options.frequency || 2);
   1479     this.decay = (this.options.decay || 1);
   1480 
   1481     this.updater = { };
   1482     this.container = container;
   1483     this.url = url;
   1484 
   1485     this.start();
   1486   },
   1487 
   1488   start: function() {
   1489     this.options.onComplete = this.updateComplete.bind(this);
   1490     this.onTimerEvent();
   1491   },
   1492 
   1493   stop: function() {
   1494     this.updater.options.onComplete = undefined;
   1495     clearTimeout(this.timer);
   1496     (this.onComplete || Prototype.emptyFunction).apply(this, arguments);
   1497   },
   1498 
   1499   updateComplete: function(response) {
   1500     if (this.options.decay) {
   1501       this.decay = (response.responseText == this.lastText ?
   1502         this.decay * this.options.decay : 1);
   1503 
   1504       this.lastText = response.responseText;
   1505     }
   1506     this.timer = this.onTimerEvent.bind(this).delay(this.decay * this.frequency);
   1507   },
   1508 
   1509   onTimerEvent: function() {
   1510     this.updater = new Ajax.Updater(this.container, this.url, this.options);
   1511   }
   1512 });
   1513 function $(element) {
   1514   if (arguments.length > 1) {
   1515     for (var i = 0, elements = [], length = arguments.length; i < length; i++)
   1516       elements.push($(arguments[i]));
   1517     return elements;
   1518   }
   1519   if (Object.isString(element))
   1520     element = document.getElementById(element);
   1521   return Element.extend(element);
   1522 }
   1523 
   1524 if (Prototype.BrowserFeatures.XPath) {
   1525   document._getElementsByXPath = function(expression, parentElement) {
   1526     var results = [];
   1527     var query = document.evaluate(expression, $(parentElement) || document,
   1528       null, XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null);
   1529     for (var i = 0, length = query.snapshotLength; i < length; i++)
   1530       results.push(Element.extend(query.snapshotItem(i)));
   1531     return results;
   1532   };
   1533 }
   1534 
   1535 /*--------------------------------------------------------------------------*/
   1536 
   1537 if (!window.Node) var Node = { };
   1538 
   1539 if (!Node.ELEMENT_NODE) {
   1540   // DOM level 2 ECMAScript Language Binding
   1541   Object.extend(Node, {
   1542     ELEMENT_NODE: 1,
   1543     ATTRIBUTE_NODE: 2,
   1544     TEXT_NODE: 3,
   1545     CDATA_SECTION_NODE: 4,
   1546     ENTITY_REFERENCE_NODE: 5,
   1547     ENTITY_NODE: 6,
   1548     PROCESSING_INSTRUCTION_NODE: 7,
   1549     COMMENT_NODE: 8,
   1550     DOCUMENT_NODE: 9,
   1551     DOCUMENT_TYPE_NODE: 10,
   1552     DOCUMENT_FRAGMENT_NODE: 11,
   1553     NOTATION_NODE: 12
   1554   });
   1555 }
   1556 
   1557 (function() {
   1558   var element = this.Element;
   1559   this.Element = function(tagName, attributes) {
   1560     attributes = attributes || { };
   1561     tagName = tagName.toLowerCase();
   1562     var cache = Element.cache;
   1563     if (Prototype.Browser.IE && attributes.name) {
   1564       tagName = '<' + tagName + ' name="' + attributes.name + '">';
   1565       delete attributes.name;
   1566       return Element.writeAttribute(document.createElement(tagName), attributes);
   1567     }
   1568     if (!cache[tagName]) cache[tagName] = Element.extend(document.createElement(tagName));
   1569     return Element.writeAttribute(cache[tagName].cloneNode(false), attributes);
   1570   };
   1571   Object.extend(this.Element, element || { });
   1572   if (element) this.Element.prototype = element.prototype;
   1573 }).call(window);
   1574 
   1575 Element.cache = { };
   1576 
   1577 Element.Methods = {
   1578   visible: function(element) {
   1579     return $(element).style.display != 'none';
   1580   },
   1581 
   1582   toggle: function(element) {
   1583     element = $(element);
   1584     Element[Element.visible(element) ? 'hide' : 'show'](element);
   1585     return element;
   1586   },
   1587 
   1588   hide: function(element) {
   1589     element = $(element);
   1590     element.style.display = 'none';
   1591     return element;
   1592   },
   1593 
   1594   show: function(element) {
   1595     element = $(element);
   1596     element.style.display = '';
   1597     return element;
   1598   },
   1599 
   1600   remove: function(element) {
   1601     element = $(element);
   1602     element.parentNode.removeChild(element);
   1603     return element;
   1604   },
   1605 
   1606   update: function(element, content) {
   1607     element = $(element);
   1608     if (content && content.toElement) content = content.toElement();
   1609     if (Object.isElement(content)) return element.update().insert(content);
   1610     content = Object.toHTML(content);
   1611     element.innerHTML = content.stripScripts();
   1612     content.evalScripts.bind(content).defer();
   1613     return element;
   1614   },
   1615 
   1616   replace: function(element, content) {
   1617     element = $(element);
   1618     if (content && content.toElement) content = content.toElement();
   1619     else if (!Object.isElement(content)) {
   1620       content = Object.toHTML(content);
   1621       var range = element.ownerDocument.createRange();
   1622       range.selectNode(element);
   1623       content.evalScripts.bind(content).defer();
   1624       content = range.createContextualFragment(content.stripScripts());
   1625     }
   1626     element.parentNode.replaceChild(content, element);
   1627     return element;
   1628   },
   1629 
   1630   insert: function(element, insertions) {
   1631     element = $(element);
   1632 
   1633     if (Object.isString(insertions) || Object.isNumber(insertions) ||
   1634         Object.isElement(insertions) || (insertions && (insertions.toElement || insertions.toHTML)))
   1635           insertions = {bottom:insertions};
   1636 
   1637     var content, insert, tagName, childNodes;
   1638 
   1639     for (var position in insertions) {
   1640       content  = insertions[position];
   1641       position = position.toLowerCase();
   1642       insert = Element._insertionTranslations[position];
   1643 
   1644       if (content && content.toElement) content = content.toElement();
   1645       if (Object.isElement(content)) {
   1646         insert(element, content);
   1647         continue;
   1648       }
   1649 
   1650       content = Object.toHTML(content);
   1651 
   1652       tagName = ((position == 'before' || position == 'after')
   1653         ? element.parentNode : element).tagName.toUpperCase();
   1654 
   1655       childNodes = Element._getContentFromAnonymousElement(tagName, content.stripScripts());
   1656 
   1657       if (position == 'top' || position == 'after') childNodes.reverse();
   1658       childNodes.each(insert.curry(element));
   1659 
   1660       content.evalScripts.bind(content).defer();
   1661     }
   1662 
   1663     return element;
   1664   },
   1665 
   1666   wrap: function(element, wrapper, attributes) {
   1667     element = $(element);
   1668     if (Object.isElement(wrapper))
   1669       $(wrapper).writeAttribute(attributes || { });
   1670     else if (Object.isString(wrapper)) wrapper = new Element(wrapper, attributes);
   1671     else wrapper = new Element('div', wrapper);
   1672     if (element.parentNode)
   1673       element.parentNode.replaceChild(wrapper, element);
   1674     wrapper.appendChild(element);
   1675     return wrapper;
   1676   },
   1677 
   1678   inspect: function(element) {
   1679     element = $(element);
   1680     var result = '<' + element.tagName.toLowerCase();
   1681     $H({'id': 'id', 'className': 'class'}).each(function(pair) {
   1682       var property = pair.first(), attribute = pair.last();
   1683       var value = (element[property] || '').toString();
   1684       if (value) result += ' ' + attribute + '=' + value.inspect(true);
   1685     });
   1686     return result + '>';
   1687   },
   1688 
   1689   recursivelyCollect: function(element, property) {
   1690     element = $(element);
   1691     var elements = [];
   1692     while (element = element[property])
   1693       if (element.nodeType == 1)
   1694         elements.push(Element.extend(element));
   1695     return elements;
   1696   },
   1697 
   1698   ancestors: function(element) {
   1699     return $(element).recursivelyCollect('parentNode');
   1700   },
   1701 
   1702   descendants: function(element) {
   1703     return $(element).select("*");
   1704   },
   1705 
   1706   firstDescendant: function(element) {
   1707     element = $(element).firstChild;
   1708     while (element && element.nodeType != 1) element = element.nextSibling;
   1709     return $(element);
   1710   },
   1711 
   1712   immediateDescendants: function(element) {
   1713     if (!(element = $(element).firstChild)) return [];
   1714     while (element && element.nodeType != 1) element = element.nextSibling;
   1715     if (element) return [element].concat($(element).nextSiblings());
   1716     return [];
   1717   },
   1718 
   1719   previousSiblings: function(element) {
   1720     return $(element).recursivelyCollect('previousSibling');
   1721   },
   1722 
   1723   nextSiblings: function(element) {
   1724     return $(element).recursivelyCollect('nextSibling');
   1725   },
   1726 
   1727   siblings: function(element) {
   1728     element = $(element);
   1729     return element.previousSiblings().reverse().concat(element.nextSiblings());
   1730   },
   1731 
   1732   match: function(element, selector) {
   1733     if (Object.isString(selector))
   1734       selector = new Selector(selector);
   1735     return selector.match($(element));
   1736   },
   1737 
   1738   up: function(element, expression, index) {
   1739     element = $(element);
   1740     if (arguments.length == 1) return $(element.parentNode);
   1741     var ancestors = element.ancestors();
   1742     return Object.isNumber(expression) ? ancestors[expression] :
   1743       Selector.findElement(ancestors, expression, index);
   1744   },
   1745 
   1746   down: function(element, expression, index) {
   1747     element = $(element);
   1748     if (arguments.length == 1) return element.firstDescendant();
   1749     return Object.isNumber(expression) ? element.descendants()[expression] :
   1750       Element.select(element, expression)[index || 0];
   1751   },
   1752 
   1753   previous: function(element, expression, index) {
   1754     element = $(element);
   1755     if (arguments.length == 1) return $(Selector.handlers.previousElementSibling(element));
   1756     var previousSiblings = element.previousSiblings();
   1757     return Object.isNumber(expression) ? previousSiblings[expression] :
   1758       Selector.findElement(previousSiblings, expression, index);
   1759   },
   1760 
   1761   next: function(element, expression, index) {
   1762     element = $(element);
   1763     if (arguments.length == 1) return $(Selector.handlers.nextElementSibling(element));
   1764     var nextSiblings = element.nextSiblings();
   1765     return Object.isNumber(expression) ? nextSiblings[expression] :
   1766       Selector.findElement(nextSiblings, expression, index);
   1767   },
   1768 
   1769   select: function() {
   1770     var args = $A(arguments), element = $(args.shift());
   1771     return Selector.findChildElements(element, args);
   1772   },
   1773 
   1774   adjacent: function() {
   1775     var args = $A(arguments), element = $(args.shift());
   1776     return Selector.findChildElements(element.parentNode, args).without(element);
   1777   },
   1778 
   1779   identify: function(element) {
   1780     element = $(element);
   1781     var id = element.readAttribute('id'), self = arguments.callee;
   1782     if (id) return id;
   1783     do { id = 'anonymous_element_' + self.counter++ } while ($(id));
   1784     element.writeAttribute('id', id);
   1785     return id;
   1786   },
   1787 
   1788   readAttribute: function(element, name) {
   1789     element = $(element);
   1790     if (Prototype.Browser.IE) {
   1791       var t = Element._attributeTranslations.read;
   1792       if (t.values[name]) return t.values[name](element, name);
   1793       if (t.names[name]) name = t.names[name];
   1794       if (name.include(':')) {
   1795         return (!element.attributes || !element.attributes[name]) ? null :
   1796          element.attributes[name].value;
   1797       }
   1798     }
   1799     return element.getAttribute(name);
   1800   },
   1801 
   1802   writeAttribute: function(element, name, value) {
   1803     element = $(element);
   1804     var attributes = { }, t = Element._attributeTranslations.write;
   1805 
   1806     if (typeof name == 'object') attributes = name;
   1807     else attributes[name] = Object.isUndefined(value) ? true : value;
   1808 
   1809     for (var attr in attributes) {
   1810       name = t.names[attr] || attr;
   1811       value = attributes[attr];
   1812       if (t.values[attr]) name = t.values[attr](element, value);
   1813       if (value === false || value === null)
   1814         element.removeAttribute(name);
   1815       else if (value === true)
   1816         element.setAttribute(name, name);
   1817       else element.setAttribute(name, value);
   1818     }
   1819     return element;
   1820   },
   1821 
   1822   getHeight: function(element) {
   1823     return $(element).getDimensions().height;
   1824   },
   1825 
   1826   getWidth: function(element) {
   1827     return $(element).getDimensions().width;
   1828   },
   1829 
   1830   classNames: function(element) {
   1831     return new Element.ClassNames(element);
   1832   },
   1833 
   1834   hasClassName: function(element, className) {
   1835     if (!(element = $(element))) return;
   1836     var elementClassName = element.className;
   1837     return (elementClassName.length > 0 && (elementClassName == className ||
   1838       new RegExp("(^|\\s)" + className + "(\\s|$)").test(elementClassName)));
   1839   },
   1840 
   1841   addClassName: function(element, className) {
   1842     if (!(element = $(element))) return;
   1843     if (!element.hasClassName(className))
   1844       element.className += (element.className ? ' ' : '') + className;
   1845     return element;
   1846   },
   1847 
   1848   removeClassName: function(element, className) {
   1849     if (!(element = $(element))) return;
   1850     element.className = element.className.replace(
   1851       new RegExp("(^|\\s+)" + className + "(\\s+|$)"), ' ').strip();
   1852     return element;
   1853   },
   1854 
   1855   toggleClassName: function(element, className) {
   1856     if (!(element = $(element))) return;
   1857     return element[element.hasClassName(className) ?
   1858       'removeClassName' : 'addClassName'](className);
   1859   },
   1860 
   1861   // removes whitespace-only text node children
   1862   cleanWhitespace: function(element) {
   1863     element = $(element);
   1864     var node = element.firstChild;
   1865     while (node) {
   1866       var nextNode = node.nextSibling;
   1867       if (node.nodeType == 3 && !/\S/.test(node.nodeValue))
   1868         element.removeChild(node);
   1869       node = nextNode;
   1870     }
   1871     return element;
   1872   },
   1873 
   1874   empty: function(element) {
   1875     return $(element).innerHTML.blank();
   1876   },
   1877 
   1878   descendantOf: function(element, ancestor) {
   1879     element = $(element), ancestor = $(ancestor);
   1880 
   1881     if (element.compareDocumentPosition)
   1882       return (element.compareDocumentPosition(ancestor) & 8) === 8;
   1883 
   1884     if (ancestor.contains)
   1885       return ancestor.contains(element) && ancestor !== element;
   1886 
   1887     while (element = element.parentNode)
   1888       if (element == ancestor) return true;
   1889 
   1890     return false;
   1891   },
   1892 
   1893   scrollTo: function(element) {
   1894     element = $(element);
   1895     var pos = element.cumulativeOffset();
   1896     window.scrollTo(pos[0], pos[1]);
   1897     return element;
   1898   },
   1899 
   1900   getStyle: function(element, style) {
   1901     element = $(element);
   1902     style = style == 'float' ? 'cssFloat' : style.camelize();
   1903     var value = element.style[style];
   1904     if (!value || value == 'auto') {
   1905       var css = document.defaultView.getComputedStyle(element, null);
   1906       value = css ? css[style] : null;
   1907     }
   1908     if (style == 'opacity') return value ? parseFloat(value) : 1.0;
   1909     return value == 'auto' ? null : value;
   1910   },
   1911 
   1912   getOpacity: function(element) {
   1913     return $(element).getStyle('opacity');
   1914   },
   1915 
   1916   setStyle: function(element, styles) {
   1917     element = $(element);
   1918     var elementStyle = element.style, match;
   1919     if (Object.isString(styles)) {
   1920       element.style.cssText += ';' + styles;
   1921       return styles.include('opacity') ?
   1922         element.setOpacity(styles.match(/opacity:\s*(\d?\.?\d*)/)[1]) : element;
   1923     }
   1924     for (var property in styles)
   1925       if (property == 'opacity') element.setOpacity(styles[property]);
   1926       else
   1927         elementStyle[(property == 'float' || property == 'cssFloat') ?
   1928           (Object.isUndefined(elementStyle.styleFloat) ? 'cssFloat' : 'styleFloat') :
   1929             property] = styles[property];
   1930 
   1931     return element;
   1932   },
   1933 
   1934   setOpacity: function(element, value) {
   1935     element = $(element);
   1936     element.style.opacity = (value == 1 || value === '') ? '' :
   1937       (value < 0.00001) ? 0 : value;
   1938     return element;
   1939   },
   1940 
   1941   getDimensions: function(element) {
   1942     element = $(element);
   1943     var display = element.getStyle('display');
   1944     if (display != 'none' && display != null) // Safari bug
   1945       return {width: element.offsetWidth, height: element.offsetHeight};
   1946 
   1947     // All *Width and *Height properties give 0 on elements with display none,
   1948     // so enable the element temporarily
   1949     var els = element.style;
   1950     var originalVisibility = els.visibility;
   1951     var originalPosition = els.position;
   1952     var originalDisplay = els.display;
   1953     els.visibility = 'hidden';
   1954     els.position = 'absolute';
   1955     els.display = 'block';
   1956     var originalWidth = element.clientWidth;
   1957     var originalHeight = element.clientHeight;
   1958     els.display = originalDisplay;
   1959     els.position = originalPosition;
   1960     els.visibility = originalVisibility;
   1961     return {width: originalWidth, height: originalHeight};
   1962   },
   1963 
   1964   makePositioned: function(element) {
   1965     element = $(element);
   1966     var pos = Element.getStyle(element, 'position');
   1967     if (pos == 'static' || !pos) {
   1968       element._madePositioned = true;
   1969       element.style.position = 'relative';
   1970       // Opera returns the offset relative to the positioning context, when an
   1971       // element is position relative but top and left have not been defined
   1972       if (Prototype.Browser.Opera) {
   1973         element.style.top = 0;
   1974         element.style.left = 0;
   1975       }
   1976     }
   1977     return element;
   1978   },
   1979 
   1980   undoPositioned: function(element) {
   1981     element = $(element);
   1982     if (element._madePositioned) {
   1983       element._madePositioned = undefined;
   1984       element.style.position =
   1985         element.style.top =
   1986         element.style.left =
   1987         element.style.bottom =
   1988         element.style.right = '';
   1989     }
   1990     return element;
   1991   },
   1992 
   1993   makeClipping: function(element) {
   1994     element = $(element);
   1995     if (element._overflow) return element;
   1996     element._overflow = Element.getStyle(element, 'overflow') || 'auto';
   1997     if (element._overflow !== 'hidden')
   1998       element.style.overflow = 'hidden';
   1999     return element;
   2000   },
   2001 
   2002   undoClipping: function(element) {
   2003     element = $(element);
   2004     if (!element._overflow) return element;
   2005     element.style.overflow = element._overflow == 'auto' ? '' : element._overflow;
   2006     element._overflow = null;
   2007     return element;
   2008   },
   2009 
   2010   cumulativeOffset: function(element) {
   2011     var valueT = 0, valueL = 0;
   2012     do {
   2013       valueT += element.offsetTop  || 0;
   2014       valueL += element.offsetLeft || 0;
   2015       element = element.offsetParent;
   2016     } while (element);
   2017     return Element._returnOffset(valueL, valueT);
   2018   },
   2019 
   2020   positionedOffset: function(element) {
   2021     var valueT = 0, valueL = 0;
   2022     do {
   2023       valueT += element.offsetTop  || 0;
   2024       valueL += element.offsetLeft || 0;
   2025       element = element.offsetParent;
   2026       if (element) {
   2027         if (element.tagName.toUpperCase() == 'BODY') break;
   2028         var p = Element.getStyle(element, 'position');
   2029         if (p !== 'static') break;
   2030       }
   2031     } while (element);
   2032     return Element._returnOffset(valueL, valueT);
   2033   },
   2034 
   2035   absolutize: function(element) {
   2036     element = $(element);
   2037     if (element.getStyle('position') == 'absolute') return element;
   2038     // Position.prepare(); // To be done manually by Scripty when it needs it.
   2039 
   2040     var offsets = element.positionedOffset();
   2041     var top     = offsets[1];
   2042     var left    = offsets[0];
   2043     var width   = element.clientWidth;
   2044     var height  = element.clientHeight;
   2045 
   2046     element._originalLeft   = left - parseFloat(element.style.left  || 0);
   2047     element._originalTop    = top  - parseFloat(element.style.top || 0);
   2048     element._originalWidth  = element.style.width;
   2049     element._originalHeight = element.style.height;
   2050 
   2051     element.style.position = 'absolute';
   2052     element.style.top    = top + 'px';
   2053     element.style.left   = left + 'px';
   2054     element.style.width  = width + 'px';
   2055     element.style.height = height + 'px';
   2056     return element;
   2057   },
   2058 
   2059   relativize: function(element) {
   2060     element = $(element);
   2061     if (element.getStyle('position') == 'relative') return element;
   2062     // Position.prepare(); // To be done manually by Scripty when it needs it.
   2063 
   2064     element.style.position = 'relative';
   2065     var top  = parseFloat(element.style.top  || 0) - (element._originalTop || 0);
   2066     var left = parseFloat(element.style.left || 0) - (element._originalLeft || 0);
   2067 
   2068     element.style.top    = top + 'px';
   2069     element.style.left   = left + 'px';
   2070     element.style.height = element._originalHeight;
   2071     element.style.width  = element._originalWidth;
   2072     return element;
   2073   },
   2074 
   2075   cumulativeScrollOffset: function(element) {
   2076     var valueT = 0, valueL = 0;
   2077     do {
   2078       valueT += element.scrollTop  || 0;
   2079       valueL += element.scrollLeft || 0;
   2080       element = element.parentNode;
   2081     } while (element);
   2082     return Element._returnOffset(valueL, valueT);
   2083   },
   2084 
   2085   getOffsetParent: function(element) {
   2086     if (element.offsetParent) return $(element.offsetParent);
   2087     if (element == document.body) return $(element);
   2088 
   2089     while ((element = element.parentNode) && element != document.body)
   2090       if (Element.getStyle(element, 'position') != 'static')
   2091         return $(element);
   2092 
   2093     return $(document.body);
   2094   },
   2095 
   2096   viewportOffset: function(forElement) {
   2097     var valueT = 0, valueL = 0;
   2098 
   2099     var element = forElement;
   2100     do {
   2101       valueT += element.offsetTop  || 0;
   2102       valueL += element.offsetLeft || 0;
   2103 
   2104       // Safari fix
   2105       if (element.offsetParent == document.body &&
   2106         Element.getStyle(element, 'position') == 'absolute') break;
   2107 
   2108     } while (element = element.offsetParent);
   2109 
   2110     element = forElement;
   2111     do {
   2112       if (!Prototype.Browser.Opera || (element.tagName && (element.tagName.toUpperCase() == 'BODY'))) {
   2113         valueT -= element.scrollTop  || 0;
   2114         valueL -= element.scrollLeft || 0;
   2115       }
   2116     } while (element = element.parentNode);
   2117 
   2118     return Element._returnOffset(valueL, valueT);
   2119   },
   2120 
   2121   clonePosition: function(element, source) {
   2122     var options = Object.extend({
   2123       setLeft:    true,
   2124       setTop:     true,
   2125       setWidth:   true,
   2126       setHeight:  true,
   2127       offsetTop:  0,
   2128       offsetLeft: 0
   2129     }, arguments[2] || { });
   2130 
   2131     // find page position of source
   2132     source = $(source);
   2133     var p = source.viewportOffset();
   2134 
   2135     // find coordinate system to use
   2136     element = $(element);
   2137     var delta = [0, 0];
   2138     var parent = null;
   2139     // delta [0,0] will do fine with position: fixed elements,
   2140     // position:absolute needs offsetParent deltas
   2141     if (Element.getStyle(element, 'position') == 'absolute') {
   2142       parent = element.getOffsetParent();
   2143       delta = parent.viewportOffset();
   2144     }
   2145 
   2146     // correct by body offsets (fixes Safari)
   2147     if (parent == document.body) {
   2148       delta[0] -= document.body.offsetLeft;
   2149       delta[1] -= document.body.offsetTop;
   2150     }
   2151 
   2152     // set position
   2153     if (options.setLeft)   element.style.left  = (p[0] - delta[0] + options.offsetLeft) + 'px';
   2154     if (options.setTop)    element.style.top   = (p[1] - delta[1] + options.offsetTop) + 'px';
   2155     if (options.setWidth)  element.style.width = source.offsetWidth + 'px';
   2156     if (options.setHeight) element.style.height = source.offsetHeight + 'px';
   2157     return element;
   2158   }
   2159 };
   2160 
   2161 Element.Methods.identify.counter = 1;
   2162 
   2163 Object.extend(Element.Methods, {
   2164   getElementsBySelector: Element.Methods.select,
   2165   childElements: Element.Methods.immediateDescendants
   2166 });
   2167 
   2168 Element._attributeTranslations = {
   2169   write: {
   2170     names: {
   2171       className: 'class',
   2172       htmlFor:   'for'
   2173     },
   2174     values: { }
   2175   }
   2176 };
   2177 
   2178 if (Prototype.Browser.Opera) {
   2179   Element.Methods.getStyle = Element.Methods.getStyle.wrap(
   2180     function(proceed, element, style) {
   2181       switch (style) {
   2182         case 'left': case 'top': case 'right': case 'bottom':
   2183           if (proceed(element, 'position') === 'static') return null;
   2184         case 'height': case 'width':
   2185           // returns '0px' for hidden elements; we want it to return null
   2186           if (!Element.visible(element)) return null;
   2187 
   2188           // returns the border-box dimensions rather than the content-box
   2189           // dimensions, so we subtract padding and borders from the value
   2190           var dim = parseInt(proceed(element, style), 10);
   2191 
   2192           if (dim !== element['offset' + style.capitalize()])
   2193             return dim + 'px';
   2194 
   2195           var properties;
   2196           if (style === 'height') {
   2197             properties = ['border-top-width', 'padding-top',
   2198              'padding-bottom', 'border-bottom-width'];
   2199           }
   2200           else {
   2201             properties = ['border-left-width', 'padding-left',
   2202              'padding-right', 'border-right-width'];
   2203           }
   2204           return properties.inject(dim, function(memo, property) {
   2205             var val = proceed(element, property);
   2206             return val === null ? memo : memo - parseInt(val, 10);
   2207           }) + 'px';
   2208         default: return proceed(element, style);
   2209       }
   2210     }
   2211   );
   2212 
   2213   Element.Methods.readAttribute = Element.Methods.readAttribute.wrap(
   2214     function(proceed, element, attribute) {
   2215       if (attribute === 'title') return element.title;
   2216       return proceed(element, attribute);
   2217     }
   2218   );
   2219 }
   2220 
   2221 else if (Prototype.Browser.IE) {
   2222   // IE doesn't report offsets correctly for static elements, so we change them
   2223   // to "relative" to get the values, then change them back.
   2224   Element.Methods.getOffsetParent = Element.Methods.getOffsetParent.wrap(
   2225     function(proceed, element) {
   2226       element = $(element);
   2227       // IE throws an error if element is not in document
   2228       try { element.offsetParent }
   2229       catch(e) { return $(document.body) }
   2230       var position = element.getStyle('position');
   2231       if (position !== 'static') return proceed(element);
   2232       element.setStyle({ position: 'relative' });
   2233       var value = proceed(element);
   2234       element.setStyle({ position: position });
   2235       return value;
   2236     }
   2237   );
   2238 
   2239   $w('positionedOffset viewportOffset').each(function(method) {
   2240     Element.Methods[method] = Element.Methods[method].wrap(
   2241       function(proceed, element) {
   2242         element = $(element);
   2243         try { element.offsetParent }
   2244         catch(e) { return Element._returnOffset(0,0) }
   2245         var position = element.getStyle('position');
   2246         if (position !== 'static') return proceed(element);
   2247         // Trigger hasLayout on the offset parent so that IE6 reports
   2248         // accurate offsetTop and offsetLeft values for position: fixed.
   2249         var offsetParent = element.getOffsetParent();
   2250         if (offsetParent && offsetParent.getStyle('position') === 'fixed')
   2251           offsetParent.setStyle({ zoom: 1 });
   2252         element.setStyle({ position: 'relative' });
   2253         var value = proceed(element);
   2254         element.setStyle({ position: position });
   2255         return value;
   2256       }
   2257     );
   2258   });
   2259 
   2260   Element.Methods.cumulativeOffset = Element.Methods.cumulativeOffset.wrap(
   2261     function(proceed, element) {
   2262       try { element.offsetParent }
   2263       catch(e) { return Element._returnOffset(0,0) }
   2264       return proceed(element);
   2265     }
   2266   );
   2267 
   2268   Element.Methods.getStyle = function(element, style) {
   2269     element = $(element);
   2270     style = (style == 'float' || style == 'cssFloat') ? 'styleFloat' : style.camelize();
   2271     var value = element.style[style];
   2272     if (!value && element.currentStyle) value = element.currentStyle[style];
   2273 
   2274     if (style == 'opacity') {
   2275       if (value = (element.getStyle('filter') || '').match(/alpha\(opacity=(.*)\)/))
   2276         if (value[1]) return parseFloat(value[1]) / 100;
   2277       return 1.0;
   2278     }
   2279 
   2280     if (value == 'auto') {
   2281       if ((style == 'width' || style == 'height') && (element.getStyle('display') != 'none'))
   2282         return element['offset' + style.capitalize()] + 'px';
   2283       return null;
   2284     }
   2285     return value;
   2286   };
   2287 
   2288   Element.Methods.setOpacity = function(element, value) {
   2289     function stripAlpha(filter){
   2290       return filter.replace(/alpha\([^\)]*\)/gi,'');
   2291     }
   2292     element = $(element);
   2293     var currentStyle = element.currentStyle;
   2294     if ((currentStyle && !currentStyle.hasLayout) ||
   2295       (!currentStyle && element.style.zoom == 'normal'))
   2296         element.style.zoom = 1;
   2297 
   2298     var filter = element.getStyle('filter'), style = element.style;
   2299     if (value == 1 || value === '') {
   2300       (filter = stripAlpha(filter)) ?
   2301         style.filter = filter : style.removeAttribute('filter');
   2302       return element;
   2303     } else if (value < 0.00001) value = 0;
   2304     style.filter = stripAlpha(filter) +
   2305       'alpha(opacity=' + (value * 100) + ')';
   2306     return element;
   2307   };
   2308 
   2309   Element._attributeTranslations = {
   2310     read: {
   2311       names: {
   2312         'class': 'className',
   2313         'for':   'htmlFor'
   2314       },
   2315       values: {
   2316         _getAttr: function(element, attribute) {
   2317           return element.getAttribute(attribute, 2);
   2318         },
   2319         _getAttrNode: function(element, attribute) {
   2320           var node = element.getAttributeNode(attribute);
   2321           return node ? node.value : "";
   2322         },
   2323         _getEv: function(element, attribute) {
   2324           attribute = element.getAttribute(attribute);
   2325           return attribute ? attribute.toString().slice(23, -2) : null;
   2326         },
   2327         _flag: function(element, attribute) {
   2328           return $(element).hasAttribute(attribute) ? attribute : null;
   2329         },
   2330         style: function(element) {
   2331           return element.style.cssText.toLowerCase();
   2332         },
   2333         title: function(element) {
   2334           return element.title;
   2335         }
   2336       }
   2337     }
   2338   };
   2339 
   2340   Element._attributeTranslations.write = {
   2341     names: Object.extend({
   2342       cellpadding: 'cellPadding',
   2343       cellspacing: 'cellSpacing'
   2344     }, Element._attributeTranslations.read.names),
   2345     values: {
   2346       checked: function(element, value) {
   2347         element.checked = !!value;
   2348       },
   2349 
   2350       style: function(element, value) {
   2351         element.style.cssText = value ? value : '';
   2352       }
   2353     }
   2354   };
   2355 
   2356   Element._attributeTranslations.has = {};
   2357 
   2358   $w('colSpan rowSpan vAlign dateTime accessKey tabIndex ' +
   2359       'encType maxLength readOnly longDesc frameBorder').each(function(attr) {
   2360     Element._attributeTranslations.write.names[attr.toLowerCase()] = attr;
   2361     Element._attributeTranslations.has[attr.toLowerCase()] = attr;
   2362   });
   2363 
   2364   (function(v) {
   2365     Object.extend(v, {
   2366       href:        v._getAttr,
   2367       src:         v._getAttr,
   2368       type:        v._getAttr,
   2369       action:      v._getAttrNode,
   2370       disabled:    v._flag,
   2371       checked:     v._flag,
   2372       readonly:    v._flag,
   2373       multiple:    v._flag,
   2374       onload:      v._getEv,
   2375       onunload:    v._getEv,
   2376       onclick:     v._getEv,
   2377       ondblclick:  v._getEv,
   2378       onmousedown: v._getEv,
   2379       onmouseup:   v._getEv,
   2380       onmouseover: v._getEv,
   2381       onmousemove: v._getEv,
   2382       onmouseout:  v._getEv,
   2383       onfocus:     v._getEv,
   2384       onblur:      v._getEv,
   2385       onkeypress:  v._getEv,
   2386       onkeydown:   v._getEv,
   2387       onkeyup:     v._getEv,
   2388       onsubmit:    v._getEv,
   2389       onreset:     v._getEv,
   2390       onselect:    v._getEv,
   2391       onchange:    v._getEv
   2392     });
   2393   })(Element._attributeTranslations.read.values);
   2394 }
   2395 
   2396 else if (Prototype.Browser.Gecko && /rv:1\.8\.0/.test(navigator.userAgent)) {
   2397   Element.Methods.setOpacity = function(element, value) {
   2398     element = $(element);
   2399     element.style.opacity = (value == 1) ? 0.999999 :
   2400       (value === '') ? '' : (value < 0.00001) ? 0 : value;
   2401     return element;
   2402   };
   2403 }
   2404 
   2405 else if (Prototype.Browser.WebKit) {
   2406   Element.Methods.setOpacity = function(element, value) {
   2407     element = $(element);
   2408     element.style.opacity = (value == 1 || value === '') ? '' :
   2409       (value < 0.00001) ? 0 : value;
   2410 
   2411     if (value == 1)
   2412       if(element.tagName.toUpperCase() == 'IMG' && element.width) {
   2413         element.width++; element.width--;
   2414       } else try {
   2415         var n = document.createTextNode(' ');
   2416         element.appendChild(n);
   2417         element.removeChild(n);
   2418       } catch (e) { }
   2419 
   2420     return element;
   2421   };
   2422 
   2423   // Safari returns margins on body which is incorrect if the child is absolutely
   2424   // positioned.  For performance reasons, redefine Element#cumulativeOffset for
   2425   // KHTML/WebKit only.
   2426   Element.Methods.cumulativeOffset = function(element) {
   2427     var valueT = 0, valueL = 0;
   2428     do {
   2429       valueT += element.offsetTop  || 0;
   2430       valueL += element.offsetLeft || 0;
   2431       if (element.offsetParent == document.body)
   2432         if (Element.getStyle(element, 'position') == 'absolute') break;
   2433 
   2434       element = element.offsetParent;
   2435     } while (element);
   2436 
   2437     return Element._returnOffset(valueL, valueT);
   2438   };
   2439 }
   2440 
   2441 if (Prototype.Browser.IE || Prototype.Browser.Opera) {
   2442   // IE and Opera are missing .innerHTML support for TABLE-related and SELECT elements
   2443   Element.Methods.update = function(element, content) {
   2444     element = $(element);
   2445 
   2446     if (content && content.toElement) content = content.toElement();
   2447     if (Object.isElement(content)) return element.update().insert(content);
   2448 
   2449     content = Object.toHTML(content);
   2450     var tagName = element.tagName.toUpperCase();
   2451 
   2452     if (tagName in Element._insertionTranslations.tags) {
   2453       $A(element.childNodes).each(function(node) { element.removeChild(node) });
   2454       Element._getContentFromAnonymousElement(tagName, content.stripScripts())
   2455         .each(function(node) { element.appendChild(node) });
   2456     }
   2457     else element.innerHTML = content.stripScripts();
   2458 
   2459     content.evalScripts.bind(content).defer();
   2460     return element;
   2461   };
   2462 }
   2463 
   2464 if ('outerHTML' in document.createElement('div')) {
   2465   Element.Methods.replace = function(element, content) {
   2466     element = $(element);
   2467 
   2468     if (content && content.toElement) content = content.toElement();
   2469     if (Object.isElement(content)) {
   2470       element.parentNode.replaceChild(content, element);
   2471       return element;
   2472     }
   2473 
   2474     content = Object.toHTML(content);
   2475     var parent = element.parentNode, tagName = parent.tagName.toUpperCase();
   2476 
   2477     if (Element._insertionTranslations.tags[tagName]) {
   2478       var nextSibling = element.next();
   2479       var fragments = Element._getContentFromAnonymousElement(tagName, content.stripScripts());
   2480       parent.removeChild(element);
   2481       if (nextSibling)
   2482         fragments.each(function(node) { parent.insertBefore(node, nextSibling) });
   2483       else
   2484         fragments.each(function(node) { parent.appendChild(node) });
   2485     }
   2486     else element.outerHTML = content.stripScripts();
   2487 
   2488     content.evalScripts.bind(content).defer();
   2489     return element;
   2490   };
   2491 }
   2492 
   2493 Element._returnOffset = function(l, t) {
   2494   var result = [l, t];
   2495   result.left = l;
   2496   result.top = t;
   2497   return result;
   2498 };
   2499 
   2500 Element._getContentFromAnonymousElement = function(tagName, html) {
   2501   var div = new Element('div'), t = Element._insertionTranslations.tags[tagName];
   2502   if (t) {
   2503     div.innerHTML = t[0] + html + t[1];
   2504     t[2].times(function() { div = div.firstChild });
   2505   } else div.innerHTML = html;
   2506   return $A(div.childNodes);
   2507 };
   2508 
   2509 Element._insertionTranslations = {
   2510   before: function(element, node) {
   2511     element.parentNode.insertBefore(node, element);
   2512   },
   2513   top: function(element, node) {
   2514     element.insertBefore(node, element.firstChild);
   2515   },
   2516   bottom: function(element, node) {
   2517     element.appendChild(node);
   2518   },
   2519   after: function(element, node) {
   2520     element.parentNode.insertBefore(node, element.nextSibling);
   2521   },
   2522   tags: {
   2523     TABLE:  ['<table>',                '</table>',                   1],
   2524     TBODY:  ['<table><tbody>',         '</tbody></table>',           2],
   2525     TR:     ['<table><tbody><tr>',     '</tr></tbody></table>',      3],
   2526     TD:     ['<table><tbody><tr><td>', '</td></tr></tbody></table>', 4],
   2527     SELECT: ['<select>',               '</select>',                  1]
   2528   }
   2529 };
   2530 
   2531 (function() {
   2532   Object.extend(this.tags, {
   2533     THEAD: this.tags.TBODY,
   2534     TFOOT: this.tags.TBODY,
   2535     TH:    this.tags.TD
   2536   });
   2537 }).call(Element._insertionTranslations);
   2538 
   2539 Element.Methods.Simulated = {
   2540   hasAttribute: function(element, attribute) {
   2541     attribute = Element._attributeTranslations.has[attribute] || attribute;
   2542     var node = $(element).getAttributeNode(attribute);
   2543     return !!(node && node.specified);
   2544   }
   2545 };
   2546 
   2547 Element.Methods.ByTag = { };
   2548 
   2549 Object.extend(Element, Element.Methods);
   2550 
   2551 if (!Prototype.BrowserFeatures.ElementExtensions &&
   2552     document.createElement('div')['__proto__']) {
   2553   window.HTMLElement = { };
   2554   window.HTMLElement.prototype = document.createElement('div')['__proto__'];
   2555   Prototype.BrowserFeatures.ElementExtensions = true;
   2556 }
   2557 
   2558 Element.extend = (function() {
   2559   if (Prototype.BrowserFeatures.SpecificElementExtensions)
   2560     return Prototype.K;
   2561 
   2562   var Methods = { }, ByTag = Element.Methods.ByTag;
   2563 
   2564   var extend = Object.extend(function(element) {
   2565     if (!element || element._extendedByPrototype ||
   2566         element.nodeType != 1 || element == window) return element;
   2567 
   2568     var methods = Object.clone(Methods),
   2569       tagName = element.tagName.toUpperCase(), property, value;
   2570 
   2571     // extend methods for specific tags
   2572     if (ByTag[tagName]) Object.extend(methods, ByTag[tagName]);
   2573 
   2574     for (property in methods) {
   2575       value = methods[property];
   2576       if (Object.isFunction(value) && !(property in element))
   2577         element[property] = value.methodize();
   2578     }
   2579 
   2580     element._extendedByPrototype = Prototype.emptyFunction;
   2581     return element;
   2582 
   2583   }, {
   2584     refresh: function() {
   2585       // extend methods for all tags (Safari doesn't need this)
   2586       if (!Prototype.BrowserFeatures.ElementExtensions) {
   2587         Object.extend(Methods, Element.Methods);
   2588         Object.extend(Methods, Element.Methods.Simulated);
   2589       }
   2590     }
   2591   });
   2592 
   2593   extend.refresh();
   2594   return extend;
   2595 })();
   2596 
   2597 Element.hasAttribute = function(element, attribute) {
   2598   if (element.hasAttribute) return element.hasAttribute(attribute);
   2599   return Element.Methods.Simulated.hasAttribute(element, attribute);
   2600 };
   2601 
   2602 Element.addMethods = function(methods) {
   2603   var F = Prototype.BrowserFeatures, T = Element.Methods.ByTag;
   2604 
   2605   if (!methods) {
   2606     Object.extend(Form, Form.Methods);
   2607     Object.extend(Form.Element, Form.Element.Methods);
   2608     Object.extend(Element.Methods.ByTag, {
   2609       "FORM":     Object.clone(Form.Methods),
   2610       "INPUT":    Object.clone(Form.Element.Methods),
   2611       "SELECT":   Object.clone(Form.Element.Methods),
   2612       "TEXTAREA": Object.clone(Form.Element.Methods)
   2613     });
   2614   }
   2615 
   2616   if (arguments.length == 2) {
   2617     var tagName = methods;
   2618     methods = arguments[1];
   2619   }
   2620 
   2621   if (!tagName) Object.extend(Element.Methods, methods || { });
   2622   else {
   2623     if (Object.isArray(tagName)) tagName.each(extend);
   2624     else extend(tagName);
   2625   }
   2626 
   2627   function extend(tagName) {
   2628     tagName = tagName.toUpperCase();
   2629     if (!Element.Methods.ByTag[tagName])
   2630       Element.Methods.ByTag[tagName] = { };
   2631     Object.extend(Element.Methods.ByTag[tagName], methods);
   2632   }
   2633 
   2634   function copy(methods, destination, onlyIfAbsent) {
   2635     onlyIfAbsent = onlyIfAbsent || false;
   2636     for (var property in methods) {
   2637       var value = methods[property];
   2638       if (!Object.isFunction(value)) continue;
   2639       if (!onlyIfAbsent || !(property in destination))
   2640         destination[property] = value.methodize();
   2641     }
   2642   }
   2643 
   2644   function findDOMClass(tagName) {
   2645     var klass;
   2646     var trans = {
   2647       "OPTGROUP": "OptGroup", "TEXTAREA": "TextArea", "P": "Paragraph",
   2648       "FIELDSET": "FieldSet", "UL": "UList", "OL": "OList", "DL": "DList",
   2649       "DIR": "Directory", "H1": "Heading", "H2": "Heading", "H3": "Heading",
   2650       "H4": "Heading", "H5": "Heading", "H6": "Heading", "Q": "Quote",
   2651       "INS": "Mod", "DEL": "Mod", "A": "Anchor", "IMG": "Image", "CAPTION":
   2652       "TableCaption", "COL": "TableCol", "COLGROUP": "TableCol", "THEAD":
   2653       "TableSection", "TFOOT": "TableSection", "TBODY": "TableSection", "TR":
   2654       "TableRow", "TH": "TableCell", "TD": "TableCell", "FRAMESET":
   2655       "FrameSet", "IFRAME": "IFrame"
   2656     };
   2657     if (trans[tagName]) klass = 'HTML' + trans[tagName] + 'Element';
   2658     if (window[klass]) return window[klass];
   2659     klass = 'HTML' + tagName + 'Element';
   2660     if (window[klass]) return window[klass];
   2661     klass = 'HTML' + tagName.capitalize() + 'Element';
   2662     if (window[klass]) return window[klass];
   2663 
   2664     window[klass] = { };
   2665     window[klass].prototype = document.createElement(tagName)['__proto__'];
   2666     return window[klass];
   2667   }
   2668 
   2669   if (F.ElementExtensions) {
   2670     copy(Element.Methods, HTMLElement.prototype);
   2671     copy(Element.Methods.Simulated, HTMLElement.prototype, true);
   2672   }
   2673 
   2674   if (F.SpecificElementExtensions) {
   2675     for (var tag in Element.Methods.ByTag) {
   2676       var klass = findDOMClass(tag);
   2677       if (Object.isUndefined(klass)) continue;
   2678       copy(T[tag], klass.prototype);
   2679     }
   2680   }
   2681 
   2682   Object.extend(Element, Element.Methods);
   2683   delete Element.ByTag;
   2684 
   2685   if (Element.extend.refresh) Element.extend.refresh();
   2686   Element.cache = { };
   2687 };
   2688 
   2689 document.viewport = {
   2690   getDimensions: function() {
   2691     var dimensions = { }, B = Prototype.Browser;
   2692     $w('width height').each(function(d) {
   2693       var D = d.capitalize();
   2694       if (B.WebKit && !document.evaluate) {
   2695         // Safari <3.0 needs self.innerWidth/Height
   2696         dimensions[d] = self['inner' + D];
   2697       } else if (B.Opera && parseFloat(window.opera.version()) < 9.5) {
   2698         // Opera <9.5 needs document.body.clientWidth/Height
   2699         dimensions[d] = document.body['client' + D]
   2700       } else {
   2701         dimensions[d] = document.documentElement['client' + D];
   2702       }
   2703     });
   2704     return dimensions;
   2705   },
   2706 
   2707   getWidth: function() {
   2708     return this.getDimensions().width;
   2709   },
   2710 
   2711   getHeight: function() {
   2712     return this.getDimensions().height;
   2713   },
   2714 
   2715   getScrollOffsets: function() {
   2716     return Element._returnOffset(
   2717       window.pageXOffset || document.documentElement.scrollLeft || document.body.scrollLeft,
   2718       window.pageYOffset || document.documentElement.scrollTop || document.body.scrollTop);
   2719   }
   2720 };
   2721 /* Portions of the Selector class are derived from Jack Slocum's DomQuery,
   2722  * part of YUI-Ext version 0.40, distributed under the terms of an MIT-style
   2723  * license.  Please see http://www.yui-ext.com/ for more information. */
   2724 
   2725 var Selector = Class.create({
   2726   initialize: function(expression) {
   2727     this.expression = expression.strip();
   2728 
   2729     if (this.shouldUseSelectorsAPI()) {
   2730       this.mode = 'selectorsAPI';
   2731     } else if (this.shouldUseXPath()) {
   2732       this.mode = 'xpath';
   2733       this.compileXPathMatcher();
   2734     } else {
   2735       this.mode = "normal";
   2736       this.compileMatcher();
   2737     }
   2738 
   2739   },
   2740 
   2741   shouldUseXPath: function() {
   2742     if (!Prototype.BrowserFeatures.XPath) return false;
   2743 
   2744     var e = this.expression;
   2745 
   2746     // Safari 3 chokes on :*-of-type and :empty
   2747     if (Prototype.Browser.WebKit &&
   2748      (e.include("-of-type") || e.include(":empty")))
   2749       return false;
   2750 
   2751     // XPath can't do namespaced attributes, nor can it read
   2752     // the "checked" property from DOM nodes
   2753     if ((/(\[[\w-]*?:|:checked)/).test(e))
   2754       return false;
   2755 
   2756     return true;
   2757   },
   2758 
   2759   shouldUseSelectorsAPI: function() {
   2760     if (!Prototype.BrowserFeatures.SelectorsAPI) return false;
   2761 
   2762     if (!Selector._div) Selector._div = new Element('div');
   2763 
   2764     // Make sure the browser treats the selector as valid. Test on an
   2765     // isolated element to minimize cost of this check.
   2766     try {
   2767       Selector._div.querySelector(this.expression);
   2768     } catch(e) {
   2769       return false;
   2770     }
   2771 
   2772     return true;
   2773   },
   2774 
   2775   compileMatcher: function() {
   2776     var e = this.expression, ps = Selector.patterns, h = Selector.handlers,
   2777         c = Selector.criteria, le, p, m;
   2778 
   2779     if (Selector._cache[e]) {
   2780       this.matcher = Selector._cache[e];
   2781       return;
   2782     }
   2783 
   2784     this.matcher = ["this.matcher = function(root) {",
   2785                     "var r = root, h = Selector.handlers, c = false, n;"];
   2786 
   2787     while (e && le != e && (/\S/).test(e)) {
   2788       le = e;
   2789       for (var i in ps) {
   2790         p = ps[i];
   2791         if (m = e.match(p)) {
   2792           this.matcher.push(Object.isFunction(c[i]) ? c[i](m) :
   2793             new Template(c[i]).evaluate(m));
   2794           e = e.replace(m[0], '');
   2795           break;
   2796         }
   2797       }
   2798     }
   2799 
   2800     this.matcher.push("return h.unique(n);\n}");
   2801     eval(this.matcher.join('\n'));
   2802     Selector._cache[this.expression] = this.matcher;
   2803   },
   2804 
   2805   compileXPathMatcher: function() {
   2806     var e = this.expression, ps = Selector.patterns,
   2807         x = Selector.xpath, le, m;
   2808 
   2809     if (Selector._cache[e]) {
   2810       this.xpath = Selector._cache[e]; return;
   2811     }
   2812 
   2813     this.matcher = ['.//*'];
   2814     while (e && le != e && (/\S/).test(e)) {
   2815       le = e;
   2816       for (var i in ps) {
   2817         if (m = e.match(ps[i])) {
   2818           this.matcher.push(Object.isFunction(x[i]) ? x[i](m) :
   2819             new Template(x[i]).evaluate(m));
   2820           e = e.replace(m[0], '');
   2821           break;
   2822         }
   2823       }
   2824     }
   2825 
   2826     this.xpath = this.matcher.join('');
   2827     Selector._cache[this.expression] = this.xpath;
   2828   },
   2829 
   2830   findElements: function(root) {
   2831     root = root || document;
   2832     var e = this.expression, results;
   2833 
   2834     switch (this.mode) {
   2835       case 'selectorsAPI':
   2836         // querySelectorAll queries document-wide, then filters to descendants
   2837         // of the context element. That's not what we want.
   2838         // Add an explicit context to the selector if necessary.
   2839         if (root !== document) {
   2840           var oldId = root.id, id = $(root).identify();
   2841           e = "#" + id + " " + e;
   2842         }
   2843 
   2844         results = $A(root.querySelectorAll(e)).map(Element.extend);
   2845         root.id = oldId;
   2846 
   2847         return results;
   2848       case 'xpath':
   2849         return document._getElementsByXPath(this.xpath, root);
   2850       default:
   2851        return this.matcher(root);
   2852     }
   2853   },
   2854 
   2855   match: function(element) {
   2856     this.tokens = [];
   2857 
   2858     var e = this.expression, ps = Selector.patterns, as = Selector.assertions;
   2859     var le, p, m;
   2860 
   2861     while (e && le !== e && (/\S/).test(e)) {
   2862       le = e;
   2863       for (var i in ps) {
   2864         p = ps[i];
   2865         if (m = e.match(p)) {
   2866           // use the Selector.assertions methods unless the selector
   2867           // is too complex.
   2868           if (as[i]) {
   2869             this.tokens.push([i, Object.clone(m)]);
   2870             e = e.replace(m[0], '');
   2871           } else {
   2872             // reluctantly do a document-wide search
   2873             // and look for a match in the array
   2874             return this.findElements(document).include(element);
   2875           }
   2876         }
   2877       }
   2878     }
   2879 
   2880     var match = true, name, matches;
   2881     for (var i = 0, token; token = this.tokens[i]; i++) {
   2882       name = token[0], matches = token[1];
   2883       if (!Selector.assertions[name](element, matches)) {
   2884         match = false; break;
   2885       }
   2886     }
   2887 
   2888     return match;
   2889   },
   2890 
   2891   toString: function() {
   2892     return this.expression;
   2893   },
   2894 
   2895   inspect: function() {
   2896     return "#<Selector:" + this.expression.inspect() + ">";
   2897   }
   2898 });
   2899 
   2900 Object.extend(Selector, {
   2901   _cache: { },
   2902 
   2903   xpath: {
   2904     descendant:   "//*",
   2905     child:        "/*",
   2906     adjacent:     "/following-sibling::*[1]",
   2907     laterSibling: '/following-sibling::*',
   2908     tagName:      function(m) {
   2909       if (m[1] == '*') return '';
   2910       return "[local-name()='" + m[1].toLowerCase() +
   2911              "' or local-name()='" + m[1].toUpperCase() + "']";
   2912     },
   2913     className:    "[contains(concat(' ', @class, ' '), ' #{1} ')]",
   2914     id:           "[@id='#{1}']",
   2915     attrPresence: function(m) {
   2916       m[1] = m[1].toLowerCase();
   2917       return new Template("[@#{1}]").evaluate(m);
   2918     },
   2919     attr: function(m) {
   2920       m[1] = m[1].toLowerCase();
   2921       m[3] = m[5] || m[6];
   2922       return new Template(Selector.xpath.operators[m[2]]).evaluate(m);
   2923     },
   2924     pseudo: function(m) {
   2925       var h = Selector.xpath.pseudos[m[1]];
   2926       if (!h) return '';
   2927       if (Object.isFunction(h)) return h(m);
   2928       return new Template(Selector.xpath.pseudos[m[1]]).evaluate(m);
   2929     },
   2930     operators: {
   2931       '=':  "[@#{1}='#{3}']",
   2932       '!=': "[@#{1}!='#{3}']",
   2933       '^=': "[starts-with(@#{1}, '#{3}')]",
   2934       '$=': "[substring(@#{1}, (string-length(@#{1}) - string-length('#{3}') + 1))='#{3}']",
   2935       '*=': "[contains(@#{1}, '#{3}')]",
   2936       '~=': "[contains(concat(' ', @#{1}, ' '), ' #{3} ')]",
   2937       '|=': "[contains(concat('-', @#{1}, '-'), '-#{3}-')]"
   2938     },
   2939     pseudos: {
   2940       'first-child': '[not(preceding-sibling::*)]',
   2941       'last-child':  '[not(following-sibling::*)]',
   2942       'only-child':  '[not(preceding-sibling::* or following-sibling::*)]',
   2943       'empty':       "[count(*) = 0 and (count(text()) = 0)]",
   2944       'checked':     "[@checked]",
   2945       'disabled':    "[(@disabled) and (@type!='hidden')]",
   2946       'enabled':     "[not(@disabled) and (@type!='hidden')]",
   2947       'not': function(m) {
   2948         var e = m[6], p = Selector.patterns,
   2949             x = Selector.xpath, le, v;
   2950 
   2951         var exclusion = [];
   2952         while (e && le != e && (/\S/).test(e)) {
   2953           le = e;
   2954           for (var i in p) {
   2955             if (m = e.match(p[i])) {
   2956               v = Object.isFunction(x[i]) ? x[i](m) : new Template(x[i]).evaluate(m);
   2957               exclusion.push("(" + v.substring(1, v.length - 1) + ")");
   2958               e = e.replace(m[0], '');
   2959               break;
   2960             }
   2961           }
   2962         }
   2963         return "[not(" + exclusion.join(" and ") + ")]";
   2964       },
   2965       'nth-child':      function(m) {
   2966         return Selector.xpath.pseudos.nth("(count(./preceding-sibling::*) + 1) ", m);
   2967       },
   2968       'nth-last-child': function(m) {
   2969         return Selector.xpath.pseudos.nth("(count(./following-sibling::*) + 1) ", m);
   2970       },
   2971       'nth-of-type':    function(m) {
   2972         return Selector.xpath.pseudos.nth("position() ", m);
   2973       },
   2974       'nth-last-of-type': function(m) {
   2975         return Selector.xpath.pseudos.nth("(last() + 1 - position()) ", m);
   2976       },
   2977       'first-of-type':  function(m) {
   2978         m[6] = "1"; return Selector.xpath.pseudos['nth-of-type'](m);
   2979       },
   2980       'last-of-type':   function(m) {
   2981         m[6] = "1"; return Selector.xpath.pseudos['nth-last-of-type'](m);
   2982       },
   2983       'only-of-type':   function(m) {
   2984         var p = Selector.xpath.pseudos; return p['first-of-type'](m) + p['last-of-type'](m);
   2985       },
   2986       nth: function(fragment, m) {
   2987         var mm, formula = m[6], predicate;
   2988         if (formula == 'even') formula = '2n+0';
   2989         if (formula == 'odd')  formula = '2n+1';
   2990         if (mm = formula.match(/^(\d+)$/)) // digit only
   2991           return '[' + fragment + "= " + mm[1] + ']';
   2992         if (mm = formula.match(/^(-?\d*)?n(([+-])(\d+))?/)) { // an+b
   2993           if (mm[1] == "-") mm[1] = -1;
   2994           var a = mm[1] ? Number(mm[1]) : 1;
   2995           var b = mm[2] ? Number(mm[2]) : 0;
   2996           predicate = "[((#{fragment} - #{b}) mod #{a} = 0) and " +
   2997           "((#{fragment} - #{b}) div #{a} >= 0)]";
   2998           return new Template(predicate).evaluate({
   2999             fragment: fragment, a: a, b: b });
   3000         }
   3001       }
   3002     }
   3003   },
   3004 
   3005   criteria: {
   3006     tagName:      'n = h.tagName(n, r, "#{1}", c);      c = false;',
   3007     className:    'n = h.className(n, r, "#{1}", c);    c = false;',
   3008     id:           'n = h.id(n, r, "#{1}", c);           c = false;',
   3009     attrPresence: 'n = h.attrPresence(n, r, "#{1}", c); c = false;',
   3010     attr: function(m) {
   3011       m[3] = (m[5] || m[6]);
   3012       return new Template('n = h.attr(n, r, "#{1}", "#{3}", "#{2}", c); c = false;').evaluate(m);
   3013     },
   3014     pseudo: function(m) {
   3015       if (m[6]) m[6] = m[6].replace(/"/g, '\\"');
   3016       return new Template('n = h.pseudo(n, "#{1}", "#{6}", r, c); c = false;').evaluate(m);
   3017     },
   3018     descendant:   'c = "descendant";',
   3019     child:        'c = "child";',
   3020     adjacent:     'c = "adjacent";',
   3021     laterSibling: 'c = "laterSibling";'
   3022   },
   3023 
   3024   patterns: {
   3025     // combinators must be listed first
   3026     // (and descendant needs to be last combinator)
   3027     laterSibling: /^\s*~\s*/,
   3028     child:        /^\s*>\s*/,
   3029     adjacent:     /^\s*\+\s*/,
   3030     descendant:   /^\s/,
   3031 
   3032     // selectors follow
   3033     tagName:      /^\s*(\*|[\w\-]+)(\b|$)?/,
   3034     id:           /^#([\w\-\*]+)(\b|$)/,
   3035     className:    /^\.([\w\-\*]+)(\b|$)/,
   3036     pseudo:
   3037 /^:((first|last|nth|nth-last|only)(-child|-of-type)|empty|checked|(en|dis)abled|not)(\((.*?)\))?(\b|$|(?=\s|[:+~>]))/,
   3038     attrPresence: /^\[((?:[\w]+:)?[\w]+)\]/,
   3039     attr:         /\[((?:[\w-]*:)?[\w-]+)\s*(?:([!^$*~|]?=)\s*((['"])([^\4]*?)\4|([^'"][^\]]*?)))?\]/
   3040   },
   3041 
   3042   // for Selector.match and Element#match
   3043   assertions: {
   3044     tagName: function(element, matches) {
   3045       return matches[1].toUpperCase() == element.tagName.toUpperCase();
   3046     },
   3047 
   3048     className: function(element, matches) {
   3049       return Element.hasClassName(element, matches[1]);
   3050     },
   3051 
   3052     id: function(element, matches) {
   3053       return element.id === matches[1];
   3054     },
   3055 
   3056     attrPresence: function(element, matches) {
   3057       return Element.hasAttribute(element, matches[1]);
   3058     },
   3059 
   3060     attr: function(element, matches) {
   3061       var nodeValue = Element.readAttribute(element, matches[1]);
   3062       return nodeValue && Selector.operators[matches[2]](nodeValue, matches[5] || matches[6]);
   3063     }
   3064   },
   3065 
   3066   handlers: {
   3067     // UTILITY FUNCTIONS
   3068     // joins two collections
   3069     concat: function(a, b) {
   3070       for (var i = 0, node; node = b[i]; i++)
   3071         a.push(node);
   3072       return a;
   3073     },
   3074 
   3075     // marks an array of nodes for counting
   3076     mark: function(nodes) {
   3077       var _true = Prototype.emptyFunction;
   3078       for (var i = 0, node; node = nodes[i]; i++)
   3079         node._countedByPrototype = _true;
   3080       return nodes;
   3081     },
   3082 
   3083     unmark: function(nodes) {
   3084       for (var i = 0, node; node = nodes[i]; i++)
   3085         node._countedByPrototype = undefined;
   3086       return nodes;
   3087     },
   3088 
   3089     // mark each child node with its position (for nth calls)
   3090     // "ofType" flag indicates whether we're indexing for nth-of-type
   3091     // rather than nth-child
   3092     index: function(parentNode, reverse, ofType) {
   3093       parentNode._countedByPrototype = Prototype.emptyFunction;
   3094       if (reverse) {
   3095         for (var nodes = parentNode.childNodes, i = nodes.length - 1, j = 1; i >= 0; i--) {
   3096           var node = nodes[i];
   3097           if (node.nodeType == 1 && (!ofType || node._countedByPrototype)) node.nodeIndex = j++;
   3098         }
   3099       } else {
   3100         for (var i = 0, j = 1, nodes = parentNode.childNodes; node = nodes[i]; i++)
   3101           if (node.nodeType == 1 && (!ofType || node._countedByPrototype)) node.nodeIndex = j++;
   3102       }
   3103     },
   3104 
   3105     // filters out duplicates and extends all nodes
   3106     unique: function(nodes) {
   3107       if (nodes.length == 0) return nodes;
   3108       var results = [], n;
   3109       for (var i = 0, l = nodes.length; i < l; i++)
   3110         if (!(n = nodes[i])._countedByPrototype) {
   3111           n._countedByPrototype = Prototype.emptyFunction;
   3112           results.push(Element.extend(n));
   3113         }
   3114       return Selector.handlers.unmark(results);
   3115     },
   3116 
   3117     // COMBINATOR FUNCTIONS
   3118     descendant: function(nodes) {
   3119       var h = Selector.handlers;
   3120       for (var i = 0, results = [], node; node = nodes[i]; i++)
   3121         h.concat(results, node.getElementsByTagName('*'));
   3122       return results;
   3123     },
   3124 
   3125     child: function(nodes) {
   3126       var h = Selector.handlers;
   3127       for (var i = 0, results = [], node; node = nodes[i]; i++) {
   3128         for (var j = 0, child; child = node.childNodes[j]; j++)
   3129           if (child.nodeType == 1 && child.tagName != '!') results.push(child);
   3130       }
   3131       return results;
   3132     },
   3133 
   3134     adjacent: function(nodes) {
   3135       for (var i = 0, results = [], node; node = nodes[i]; i++) {
   3136         var next = this.nextElementSibling(node);
   3137         if (next) results.push(next);
   3138       }
   3139       return results;
   3140     },
   3141 
   3142     laterSibling: function(nodes) {
   3143       var h = Selector.handlers;
   3144       for (var i = 0, results = [], node; node = nodes[i]; i++)
   3145         h.concat(results, Element.nextSiblings(node));
   3146       return results;
   3147     },
   3148 
   3149     nextElementSibling: function(node) {
   3150       while (node = node.nextSibling)
   3151         if (node.nodeType == 1) return node;
   3152       return null;
   3153     },
   3154 
   3155     previousElementSibling: function(node) {
   3156       while (node = node.previousSibling)
   3157         if (node.nodeType == 1) return node;
   3158       return null;
   3159     },
   3160 
   3161     // TOKEN FUNCTIONS
   3162     tagName: function(nodes, root, tagName, combinator) {
   3163       var uTagName = tagName.toUpperCase();
   3164       var results = [], h = Selector.handlers;
   3165       if (nodes) {
   3166         if (combinator) {
   3167           // fastlane for ordinary descendant combinators
   3168           if (combinator == "descendant") {
   3169             for (var i = 0, node; node = nodes[i]; i++)
   3170               h.concat(results, node.getElementsByTagName(tagName));
   3171             return results;
   3172           } else nodes = this[combinator](nodes);
   3173           if (tagName == "*") return nodes;
   3174         }
   3175         for (var i = 0, node; node = nodes[i]; i++)
   3176           if (node.tagName.toUpperCase() === uTagName) results.push(node);
   3177         return results;
   3178       } else return root.getElementsByTagName(tagName);
   3179     },
   3180 
   3181     id: function(nodes, root, id, combinator) {
   3182       var targetNode = $(id), h = Selector.handlers;
   3183       if (!targetNode) return [];
   3184       if (!nodes && root == document) return [targetNode];
   3185       if (nodes) {
   3186         if (combinator) {
   3187           if (combinator == 'child') {
   3188             for (var i = 0, node; node = nodes[i]; i++)
   3189               if (targetNode.parentNode == node) return [targetNode];
   3190           } else if (combinator == 'descendant') {
   3191             for (var i = 0, node; node = nodes[i]; i++)
   3192               if (Element.descendantOf(targetNode, node)) return [targetNode];
   3193           } else if (combinator == 'adjacent') {
   3194             for (var i = 0, node; node = nodes[i]; i++)
   3195               if (Selector.handlers.previousElementSibling(targetNode) == node)
   3196                 return [targetNode];
   3197           } else nodes = h[combinator](nodes);
   3198         }
   3199         for (var i = 0, node; node = nodes[i]; i++)
   3200           if (node == targetNode) return [targetNode];
   3201         return [];
   3202       }
   3203       return (targetNode && Element.descendantOf(targetNode, root)) ? [targetNode] : [];
   3204     },
   3205 
   3206     className: function(nodes, root, className, combinator) {
   3207       if (nodes && combinator) nodes = this[combinator](nodes);
   3208       return Selector.handlers.byClassName(nodes, root, className);
   3209     },
   3210 
   3211     byClassName: function(nodes, root, className) {
   3212       if (!nodes) nodes = Selector.handlers.descendant([root]);
   3213       var needle = ' ' + className + ' ';
   3214       for (var i = 0, results = [], node, nodeClassName; node = nodes[i]; i++) {
   3215         nodeClassName = node.className;
   3216         if (nodeClassName.length == 0) continue;
   3217         if (nodeClassName == className || (' ' + nodeClassName + ' ').include(needle))
   3218           results.push(node);
   3219       }
   3220       return results;
   3221     },
   3222 
   3223     attrPresence: function(nodes, root, attr, combinator) {
   3224       if (!nodes) nodes = root.getElementsByTagName("*");
   3225       if (nodes && combinator) nodes = this[combinator](nodes);
   3226       var results = [];
   3227       for (var i = 0, node; node = nodes[i]; i++)
   3228         if (Element.hasAttribute(node, attr)) results.push(node);
   3229       return results;
   3230     },
   3231 
   3232     attr: function(nodes, root, attr, value, operator, combinator) {
   3233       if (!nodes) nodes = root.getElementsByTagName("*");
   3234       if (nodes && combinator) nodes = this[combinator](nodes);
   3235       var handler = Selector.operators[operator], results = [];
   3236       for (var i = 0, node; node = nodes[i]; i++) {
   3237         var nodeValue = Element.readAttribute(node, attr);
   3238         if (nodeValue === null) continue;
   3239         if (handler(nodeValue, value)) results.push(node);
   3240       }
   3241       return results;
   3242     },
   3243 
   3244     pseudo: function(nodes, name, value, root, combinator) {
   3245       if (nodes && combinator) nodes = this[combinator](nodes);
   3246       if (!nodes) nodes = root.getElementsByTagName("*");
   3247       return Selector.pseudos[name](nodes, value, root);
   3248     }
   3249   },
   3250 
   3251   pseudos: {
   3252     'first-child': function(nodes, value, root) {
   3253       for (var i = 0, results = [], node; node = nodes[i]; i++) {
   3254         if (Selector.handlers.previousElementSibling(node)) continue;
   3255           results.push(node);
   3256       }
   3257       return results;
   3258     },
   3259     'last-child': function(nodes, value, root) {
   3260       for (var i = 0, results = [], node; node = nodes[i]; i++) {
   3261         if (Selector.handlers.nextElementSibling(node)) continue;
   3262           results.push(node);
   3263       }
   3264       return results;
   3265     },
   3266     'only-child': function(nodes, value, root) {
   3267       var h = Selector.handlers;
   3268       for (var i = 0, results = [], node; node = nodes[i]; i++)
   3269         if (!h.previousElementSibling(node) && !h.nextElementSibling(node))
   3270           results.push(node);
   3271       return results;
   3272     },
   3273     'nth-child':        function(nodes, formula, root) {
   3274       return Selector.pseudos.nth(nodes, formula, root);
   3275     },
   3276     'nth-last-child':   function(nodes, formula, root) {
   3277       return Selector.pseudos.nth(nodes, formula, root, true);
   3278     },
   3279     'nth-of-type':      function(nodes, formula, root) {
   3280       return Selector.pseudos.nth(nodes, formula, root, false, true);
   3281     },
   3282     'nth-last-of-type': function(nodes, formula, root) {
   3283       return Selector.pseudos.nth(nodes, formula, root, true, true);
   3284     },
   3285     'first-of-type':    function(nodes, formula, root) {
   3286       return Selector.pseudos.nth(nodes, "1", root, false, true);
   3287     },
   3288     'last-of-type':     function(nodes, formula, root) {
   3289       return Selector.pseudos.nth(nodes, "1", root, true, true);
   3290     },
   3291     'only-of-type':     function(nodes, formula, root) {
   3292       var p = Selector.pseudos;
   3293       return p['last-of-type'](p['first-of-type'](nodes, formula, root), formula, root);
   3294     },
   3295 
   3296     // handles the an+b logic
   3297     getIndices: function(a, b, total) {
   3298       if (a == 0) return b > 0 ? [b] : [];
   3299       return $R(1, total).inject([], function(memo, i) {
   3300         if (0 == (i - b) % a && (i - b) / a >= 0) memo.push(i);
   3301         return memo;
   3302       });
   3303     },
   3304 
   3305     // handles nth(-last)-child, nth(-last)-of-type, and (first|last)-of-type
   3306     nth: function(nodes, formula, root, reverse, ofType) {
   3307       if (nodes.length == 0) return [];
   3308       if (formula == 'even') formula = '2n+0';
   3309       if (formula == 'odd')  formula = '2n+1';
   3310       var h = Selector.handlers, results = [], indexed = [], m;
   3311       h.mark(nodes);
   3312       for (var i = 0, node; node = nodes[i]; i++) {
   3313         if (!node.parentNode._countedByPrototype) {
   3314           h.index(node.parentNode, reverse, ofType);
   3315           indexed.push(node.parentNode);
   3316         }
   3317       }
   3318       if (formula.match(/^\d+$/)) { // just a number
   3319         formula = Number(formula);
   3320         for (var i = 0, node; node = nodes[i]; i++)
   3321           if (node.nodeIndex == formula) results.push(node);
   3322       } else if (m = formula.match(/^(-?\d*)?n(([+-])(\d+))?/)) { // an+b
   3323         if (m[1] == "-") m[1] = -1;
   3324         var a = m[1] ? Number(m[1]) : 1;
   3325         var b = m[2] ? Number(m[2]) : 0;
   3326         var indices = Selector.pseudos.getIndices(a, b, nodes.length);
   3327         for (var i = 0, node, l = indices.length; node = nodes[i]; i++) {
   3328           for (var j = 0; j < l; j++)
   3329             if (node.nodeIndex == indices[j]) results.push(node);
   3330         }
   3331       }
   3332       h.unmark(nodes);
   3333       h.unmark(indexed);
   3334       return results;
   3335     },
   3336 
   3337     'empty': function(nodes, value, root) {
   3338       for (var i = 0, results = [], node; node = nodes[i]; i++) {
   3339         // IE treats comments as element nodes
   3340         if (node.tagName == '!' || node.firstChild) continue;
   3341         results.push(node);
   3342       }
   3343       return results;
   3344     },
   3345 
   3346     'not': function(nodes, selector, root) {
   3347       var h = Selector.handlers, selectorType, m;
   3348       var exclusions = new Selector(selector).findElements(root);
   3349       h.mark(exclusions);
   3350       for (var i = 0, results = [], node; node = nodes[i]; i++)
   3351         if (!node._countedByPrototype) results.push(node);
   3352       h.unmark(exclusions);
   3353       return results;
   3354     },
   3355 
   3356     'enabled': function(nodes, value, root) {
   3357       for (var i = 0, results = [], node; node = nodes[i]; i++)
   3358         if (!node.disabled && (!node.type || node.type !== 'hidden'))
   3359           results.push(node);
   3360       return results;
   3361     },
   3362 
   3363     'disabled': function(nodes, value, root) {
   3364       for (var i = 0, results = [], node; node = nodes[i]; i++)
   3365         if (node.disabled) results.push(node);
   3366       return results;
   3367     },
   3368 
   3369     'checked': function(nodes, value, root) {
   3370       for (var i = 0, results = [], node; node = nodes[i]; i++)
   3371         if (node.checked) results.push(node);
   3372       return results;
   3373     }
   3374   },
   3375 
   3376   operators: {
   3377     '=':  function(nv, v) { return nv == v; },
   3378     '!=': function(nv, v) { return nv != v; },
   3379     '^=': function(nv, v) { return nv == v || nv && nv.startsWith(v); },
   3380     '$=': function(nv, v) { return nv == v || nv && nv.endsWith(v); },
   3381     '*=': function(nv, v) { return nv == v || nv && nv.include(v); },
   3382     '$=': function(nv, v) { return nv.endsWith(v); },
   3383     '*=': function(nv, v) { return nv.include(v); },
   3384     '~=': function(nv, v) { return (' ' + nv + ' ').include(' ' + v + ' '); },
   3385     '|=': function(nv, v) { return ('-' + (nv || "").toUpperCase() +
   3386      '-').include('-' + (v || "").toUpperCase() + '-'); }
   3387   },
   3388 
   3389   split: function(expression) {
   3390     var expressions = [];
   3391     expression.scan(/(([\w#:.~>+()\s-]+|\*|\[.*?\])+)\s*(,|$)/, function(m) {
   3392       expressions.push(m[1].strip());
   3393     });
   3394     return expressions;
   3395   },
   3396 
   3397   matchElements: function(elements, expression) {
   3398     var matches = $$(expression), h = Selector.handlers;
   3399     h.mark(matches);
   3400     for (var i = 0, results = [], element; element = elements[i]; i++)
   3401       if (element._countedByPrototype) results.push(element);
   3402     h.unmark(matches);
   3403     return results;
   3404   },
   3405 
   3406   findElement: function(elements, expression, index) {
   3407     if (Object.isNumber(expression)) {
   3408       index = expression; expression = false;
   3409     }
   3410     return Selector.matchElements(elements, expression || '*')[index || 0];
   3411   },
   3412 
   3413   findChildElements: function(element, expressions) {
   3414     expressions = Selector.split(expressions.join(','));
   3415     var results = [], h = Selector.handlers;
   3416     for (var i = 0, l = expressions.length, selector; i < l; i++) {
   3417       selector = new Selector(expressions[i].strip());
   3418       h.concat(results, selector.findElements(element));
   3419     }
   3420     return (l > 1) ? h.unique(results) : results;
   3421   }
   3422 });
   3423 
   3424 if (Prototype.Browser.IE) {
   3425   Object.extend(Selector.handlers, {
   3426     // IE returns comment nodes on getElementsByTagName("*").
   3427     // Filter them out.
   3428     concat: function(a, b) {
   3429       for (var i = 0, node; node = b[i]; i++)
   3430         if (node.tagName !== "!") a.push(node);
   3431       return a;
   3432     },
   3433 
   3434     // IE improperly serializes _countedByPrototype in (inner|outer)HTML.
   3435     unmark: function(nodes) {
   3436       for (var i = 0, node; node = nodes[i]; i++)
   3437         node.removeAttribute('_countedByPrototype');
   3438       return nodes;
   3439     }
   3440   });
   3441 }
   3442 
   3443 function $$() {
   3444   return Selector.findChildElements(document, $A(arguments));
   3445 }
   3446 var Form = {
   3447   reset: function(form) {
   3448     $(form).reset();
   3449     return form;
   3450   },
   3451 
   3452   serializeElements: function(elements, options) {
   3453     if (typeof options != 'object') options = { hash: !!options };
   3454     else if (Object.isUndefined(options.hash)) options.hash = true;
   3455     var key, value, submitted = false, submit = options.submit;
   3456 
   3457     var data = elements.inject({ }, function(result, element) {
   3458       if (!element.disabled && element.name) {
   3459         key = element.name; value = $(element).getValue();
   3460         if (value != null && element.type != 'file' && (element.type != 'submit' || (!submitted &&
   3461             submit !== false && (!submit || key == submit) && (submitted = true)))) {
   3462           if (key in result) {
   3463             // a key is already present; construct an array of values
   3464             if (!Object.isArray(result[key])) result[key] = [result[key]];
   3465             result[key].push(value);
   3466           }
   3467           else result[key] = value;
   3468         }
   3469       }
   3470       return result;
   3471     });
   3472 
   3473     return options.hash ? data : Object.toQueryString(data);
   3474   }
   3475 };
   3476 
   3477 Form.Methods = {
   3478   serialize: function(form, options) {
   3479     return Form.serializeElements(Form.getElements(form), options);
   3480   },
   3481 
   3482   getElements: function(form) {
   3483     return $A($(form).getElementsByTagName('*')).inject([],
   3484       function(elements, child) {
   3485         if (Form.Element.Serializers[child.tagName.toLowerCase()])
   3486           elements.push(Element.extend(child));
   3487         return elements;
   3488       }
   3489     );
   3490   },
   3491 
   3492   getInputs: function(form, typeName, name) {
   3493     form = $(form);
   3494     var inputs = form.getElementsByTagName('input');
   3495 
   3496     if (!typeName && !name) return $A(inputs).map(Element.extend);
   3497 
   3498     for (var i = 0, matchingInputs = [], length = inputs.length; i < length; i++) {
   3499       var input = inputs[i];
   3500       if ((typeName && input.type != typeName) || (name && input.name != name))
   3501         continue;
   3502       matchingInputs.push(Element.extend(input));
   3503     }
   3504 
   3505     return matchingInputs;
   3506   },
   3507 
   3508   disable: function(form) {
   3509     form = $(form);
   3510     Form.getElements(form).invoke('disable');
   3511     return form;
   3512   },
   3513 
   3514   enable: function(form) {
   3515     form = $(form);
   3516     Form.getElements(form).invoke('enable');
   3517     return form;
   3518   },
   3519 
   3520   findFirstElement: function(form) {
   3521     var elements = $(form).getElements().findAll(function(element) {
   3522       return 'hidden' != element.type && !element.disabled;
   3523     });
   3524     var firstByIndex = elements.findAll(function(element) {
   3525       return element.hasAttribute('tabIndex') && element.tabIndex >= 0;
   3526     }).sortBy(function(element) { return element.tabIndex }).first();
   3527 
   3528     return firstByIndex ? firstByIndex : elements.find(function(element) {
   3529       return ['input', 'select', 'textarea'].include(element.tagName.toLowerCase());
   3530     });
   3531   },
   3532 
   3533   focusFirstElement: function(form) {
   3534     form = $(form);
   3535     form.findFirstElement().activate();
   3536     return form;
   3537   },
   3538 
   3539   request: function(form, options) {
   3540     form = $(form), options = Object.clone(options || { });
   3541 
   3542     var params = options.parameters, action = form.readAttribute('action') || '';
   3543     if (action.blank()) action = window.location.href;
   3544     options.parameters = form.serialize(true);
   3545 
   3546     if (params) {
   3547       if (Object.isString(params)) params = params.toQueryParams();
   3548       Object.extend(options.parameters, params);
   3549     }
   3550 
   3551     if (form.hasAttribute('method') && !options.method)
   3552       options.method = form.method;
   3553 
   3554     return new Ajax.Request(action, options);
   3555   }
   3556 };
   3557 
   3558 /*--------------------------------------------------------------------------*/
   3559 
   3560 Form.Element = {
   3561   focus: function(element) {
   3562     $(element).focus();
   3563     return element;
   3564   },
   3565 
   3566   select: function(element) {
   3567     $(element).select();
   3568     return element;
   3569   }
   3570 };
   3571 
   3572 Form.Element.Methods = {
   3573   serialize: function(element) {
   3574     element = $(element);
   3575     if (!element.disabled && element.name) {
   3576       var value = element.getValue();
   3577       if (value != undefined) {
   3578         var pair = { };
   3579         pair[element.name] = value;
   3580         return Object.toQueryString(pair);
   3581       }
   3582     }
   3583     return '';
   3584   },
   3585 
   3586   getValue: function(element) {
   3587     element = $(element);
   3588     var method = element.tagName.toLowerCase();
   3589     return Form.Element.Serializers[method](element);
   3590   },
   3591 
   3592   setValue: function(element, value) {
   3593     element = $(element);
   3594     var method = element.tagName.toLowerCase();
   3595     Form.Element.Serializers[method](element, value);
   3596     return element;
   3597   },
   3598 
   3599   clear: function(element) {
   3600     $(element).value = '';
   3601     return element;
   3602   },
   3603 
   3604   present: function(element) {
   3605     return $(element).value != '';
   3606   },
   3607 
   3608   activate: function(element) {
   3609     element = $(element);
   3610     try {
   3611       element.focus();
   3612       if (element.select && (element.tagName.toLowerCase() != 'input' ||
   3613           !['button', 'reset', 'submit'].include(element.type)))
   3614         element.select();
   3615     } catch (e) { }
   3616     return element;
   3617   },
   3618 
   3619   disable: function(element) {
   3620     element = $(element);
   3621     element.disabled = true;
   3622     return element;
   3623   },
   3624 
   3625   enable: function(element) {
   3626     element = $(element);
   3627     element.disabled = false;
   3628     return element;
   3629   }
   3630 };
   3631 
   3632 /*--------------------------------------------------------------------------*/
   3633 
   3634 var Field = Form.Element;
   3635 var $F = Form.Element.Methods.getValue;
   3636 
   3637 /*--------------------------------------------------------------------------*/
   3638 
   3639 Form.Element.Serializers = {
   3640   input: function(element, value) {
   3641     switch (element.type.toLowerCase()) {
   3642       case 'checkbox':
   3643       case 'radio':
   3644         return Form.Element.Serializers.inputSelector(element, value);
   3645       default:
   3646         return Form.Element.Serializers.textarea(element, value);
   3647     }
   3648   },
   3649 
   3650   inputSelector: function(element, value) {
   3651     if (Object.isUndefined(value)) return element.checked ? element.value : null;
   3652     else element.checked = !!value;
   3653   },
   3654 
   3655   textarea: function(element, value) {
   3656     if (Object.isUndefined(value)) return element.value;
   3657     else element.value = value;
   3658   },
   3659 
   3660   select: function(element, value) {
   3661     if (Object.isUndefined(value))
   3662       return this[element.type == 'select-one' ?
   3663         'selectOne' : 'selectMany'](element);
   3664     else {
   3665       var opt, currentValue, single = !Object.isArray(value);
   3666       for (var i = 0, length = element.length; i < length; i++) {
   3667         opt = element.options[i];
   3668         currentValue = this.optionValue(opt);
   3669         if (single) {
   3670           if (currentValue == value) {
   3671             opt.selected = true;
   3672             return;
   3673           }
   3674         }
   3675         else opt.selected = value.include(currentValue);
   3676       }
   3677     }
   3678   },
   3679 
   3680   selectOne: function(element) {
   3681     var index = element.selectedIndex;
   3682     return index >= 0 ? this.optionValue(element.options[index]) : null;
   3683   },
   3684 
   3685   selectMany: function(element) {
   3686     var values, length = element.length;
   3687     if (!length) return null;
   3688 
   3689     for (var i = 0, values = []; i < length; i++) {
   3690       var opt = element.options[i];
   3691       if (opt.selected) values.push(this.optionValue(opt));
   3692     }
   3693     return values;
   3694   },
   3695 
   3696   optionValue: function(opt) {
   3697     // extend element because hasAttribute may not be native
   3698     return Element.extend(opt).hasAttribute('value') ? opt.value : opt.text;
   3699   }
   3700 };
   3701 
   3702 /*--------------------------------------------------------------------------*/
   3703 
   3704 Abstract.TimedObserver = Class.create(PeriodicalExecuter, {
   3705   initialize: function($super, element, frequency, callback) {
   3706     $super(callback, frequency);
   3707     this.element   = $(element);
   3708     this.lastValue = this.getValue();
   3709   },
   3710 
   3711   execute: function() {
   3712     var value = this.getValue();
   3713     if (Object.isString(this.lastValue) && Object.isString(value) ?
   3714         this.lastValue != value : String(this.lastValue) != String(value)) {
   3715       this.callback(this.element, value);
   3716       this.lastValue = value;
   3717     }
   3718   }
   3719 });
   3720 
   3721 Form.Element.Observer = Class.create(Abstract.TimedObserver, {
   3722   getValue: function() {
   3723     return Form.Element.getValue(this.element);
   3724   }
   3725 });
   3726 
   3727 Form.Observer = Class.create(Abstract.TimedObserver, {
   3728   getValue: function() {
   3729     return Form.serialize(this.element);
   3730   }
   3731 });
   3732 
   3733 /*--------------------------------------------------------------------------*/
   3734 
   3735 Abstract.EventObserver = Class.create({
   3736   initialize: function(element, callback) {
   3737     this.element  = $(element);
   3738     this.callback = callback;
   3739 
   3740     this.lastValue = this.getValue();
   3741     if (this.element.tagName.toLowerCase() == 'form')
   3742       this.registerFormCallbacks();
   3743     else
   3744       this.registerCallback(this.element);
   3745   },
   3746 
   3747   onElementEvent: function() {
   3748     var value = this.getValue();
   3749     if (this.lastValue != value) {
   3750       this.callback(this.element, value);
   3751       this.lastValue = value;
   3752     }
   3753   },
   3754 
   3755   registerFormCallbacks: function() {
   3756     Form.getElements(this.element).each(this.registerCallback, this);
   3757   },
   3758 
   3759   registerCallback: function(element) {
   3760     if (element.type) {
   3761       switch (element.type.toLowerCase()) {
   3762         case 'checkbox':
   3763         case 'radio':
   3764           Event.observe(element, 'click', this.onElementEvent.bind(this));
   3765           break;
   3766         default:
   3767           Event.observe(element, 'change', this.onElementEvent.bind(this));
   3768           break;
   3769       }
   3770     }
   3771   }
   3772 });
   3773 
   3774 Form.Element.EventObserver = Class.create(Abstract.EventObserver, {
   3775   getValue: function() {
   3776     return Form.Element.getValue(this.element);
   3777   }
   3778 });
   3779 
   3780 Form.EventObserver = Class.create(Abstract.EventObserver, {
   3781   getValue: function() {
   3782     return Form.serialize(this.element);
   3783   }
   3784 });
   3785 if (!window.Event) var Event = { };
   3786 
   3787 Object.extend(Event, {
   3788   KEY_BACKSPACE: 8,
   3789   KEY_TAB:       9,
   3790   KEY_RETURN:   13,
   3791   KEY_ESC:      27,
   3792   KEY_LEFT:     37,
   3793   KEY_UP:       38,
   3794   KEY_RIGHT:    39,
   3795   KEY_DOWN:     40,
   3796   KEY_DELETE:   46,
   3797   KEY_HOME:     36,
   3798   KEY_END:      35,
   3799   KEY_PAGEUP:   33,
   3800   KEY_PAGEDOWN: 34,
   3801   KEY_INSERT:   45,
   3802 
   3803   cache: { },
   3804 
   3805   relatedTarget: function(event) {
   3806     var element;
   3807     switch(event.type) {
   3808       case 'mouseover': element = event.fromElement; break;
   3809       case 'mouseout':  element = event.toElement;   break;
   3810       default: return null;
   3811     }
   3812     return Element.extend(element);
   3813   }
   3814 });
   3815 
   3816 Event.Methods = (function() {
   3817   var isButton;
   3818 
   3819   if (Prototype.Browser.IE) {
   3820     var buttonMap = { 0: 1, 1: 4, 2: 2 };
   3821     isButton = function(event, code) {
   3822       return event.button == buttonMap[code];
   3823     };
   3824 
   3825   } else if (Prototype.Browser.WebKit) {
   3826     isButton = function(event, code) {
   3827       switch (code) {
   3828         case 0: return event.which == 1 && !event.metaKey;
   3829         case 1: return event.which == 1 && event.metaKey;
   3830         default: return false;
   3831       }
   3832     };
   3833 
   3834   } else {
   3835     isButton = function(event, code) {
   3836       return event.which ? (event.which === code + 1) : (event.button === code);
   3837     };
   3838   }
   3839 
   3840   return {
   3841     isLeftClick:   function(event) { return isButton(event, 0) },
   3842     isMiddleClick: function(event) { return isButton(event, 1) },
   3843     isRightClick:  function(event) { return isButton(event, 2) },
   3844 
   3845     element: function(event) {
   3846       event = Event.extend(event);
   3847 
   3848       var node          = event.target,
   3849           type          = event.type,
   3850           currentTarget = event.currentTarget;
   3851 
   3852       if (currentTarget && currentTarget.tagName) {
   3853         // Firefox screws up the "click" event when moving between radio buttons
   3854         // via arrow keys. It also screws up the "load" and "error" events on images,
   3855         // reporting the document as the target instead of the original image.
   3856         if (type === 'load' || type === 'error' ||
   3857           (type === 'click' && currentTarget.tagName.toLowerCase() === 'input'
   3858             && currentTarget.type === 'radio'))
   3859               node = currentTarget;
   3860       }
   3861       if (node.nodeType == Node.TEXT_NODE) node = node.parentNode;
   3862       return Element.extend(node);
   3863     },
   3864 
   3865     findElement: function(event, expression) {
   3866       var element = Event.element(event);
   3867       if (!expression) return element;
   3868       var elements = [element].concat(element.ancestors());
   3869       return Selector.findElement(elements, expression, 0);
   3870     },
   3871 
   3872     pointer: function(event) {
   3873       var docElement = document.documentElement,
   3874       body = document.body || { scrollLeft: 0, scrollTop: 0 };
   3875       return {
   3876         x: event.pageX || (event.clientX +
   3877           (docElement.scrollLeft || body.scrollLeft) -
   3878           (docElement.clientLeft || 0)),
   3879         y: event.pageY || (event.clientY +
   3880           (docElement.scrollTop || body.scrollTop) -
   3881           (docElement.clientTop || 0))
   3882       };
   3883     },
   3884 
   3885     pointerX: function(event) { return Event.pointer(event).x },
   3886     pointerY: function(event) { return Event.pointer(event).y },
   3887 
   3888     stop: function(event) {
   3889       Event.extend(event);
   3890       event.preventDefault();
   3891       event.stopPropagation();
   3892       event.stopped = true;
   3893     }
   3894   };
   3895 })();
   3896 
   3897 Event.extend = (function() {
   3898   var methods = Object.keys(Event.Methods).inject({ }, function(m, name) {
   3899     m[name] = Event.Methods[name].methodize();
   3900     return m;
   3901   });
   3902 
   3903   if (Prototype.Browser.IE) {
   3904     Object.extend(methods, {
   3905       stopPropagation: function() { this.cancelBubble = true },
   3906       preventDefault:  function() { this.returnValue = false },
   3907       inspect: function() { return "[object Event]" }
   3908     });
   3909 
   3910     return function(event) {
   3911       if (!event) return false;
   3912       if (event._extendedByPrototype) return event;
   3913 
   3914       event._extendedByPrototype = Prototype.emptyFunction;
   3915       var pointer = Event.pointer(event);
   3916       Object.extend(event, {
   3917         target: event.srcElement,
   3918         relatedTarget: Event.relatedTarget(event),
   3919         pageX:  pointer.x,
   3920         pageY:  pointer.y
   3921       });
   3922       return Object.extend(event, methods);
   3923     };
   3924 
   3925   } else {
   3926     Event.prototype = Event.prototype || document.createEvent("HTMLEvents")['__proto__'];
   3927     Object.extend(Event.prototype, methods);
   3928     return Prototype.K;
   3929   }
   3930 })();
   3931 
   3932 Object.extend(Event, (function() {
   3933   var cache = Event.cache;
   3934 
   3935   function getEventID(element) {
   3936     if (element._prototypeEventID) return element._prototypeEventID[0];
   3937     arguments.callee.id = arguments.callee.id || 1;
   3938     return element._prototypeEventID = [++arguments.callee.id];
   3939   }
   3940 
   3941   function getDOMEventName(eventName) {
   3942     if (eventName && eventName.include(':')) return "dataavailable";
   3943     return eventName;
   3944   }
   3945 
   3946   function getCacheForID(id) {
   3947     return cache[id] = cache[id] || { };
   3948   }
   3949 
   3950   function getWrappersForEventName(id, eventName) {
   3951     var c = getCacheForID(id);
   3952     return c[eventName] = c[eventName] || [];
   3953   }
   3954 
   3955   function createWrapper(element, eventName, handler) {
   3956     var id = getEventID(element);
   3957     var c = getWrappersForEventName(id, eventName);
   3958     if (c.pluck("handler").include(handler)) return false;
   3959 
   3960     var wrapper = function(event) {
   3961       if (!Event || !Event.extend ||
   3962         (event.eventName && event.eventName != eventName))
   3963           return false;
   3964 
   3965       Event.extend(event);
   3966       handler.call(element, event);
   3967     };
   3968 
   3969     wrapper.handler = handler;
   3970     c.push(wrapper);
   3971     return wrapper;
   3972   }
   3973 
   3974   function findWrapper(id, eventName, handler) {
   3975     var c = getWrappersForEventName(id, eventName);
   3976     return c.find(function(wrapper) { return wrapper.handler == handler });
   3977   }
   3978 
   3979   function destroyWrapper(id, eventName, handler) {
   3980     var c = getCacheForID(id);
   3981     if (!c[eventName]) return false;
   3982     c[eventName] = c[eventName].without(findWrapper(id, eventName, handler));
   3983   }
   3984 
   3985   function destroyCache() {
   3986     for (var id in cache)
   3987       for (var eventName in cache[id])
   3988         cache[id][eventName] = null;
   3989   }
   3990 
   3991 
   3992   // Internet Explorer needs to remove event handlers on page unload
   3993   // in order to avoid memory leaks.
   3994   if (window.attachEvent) {
   3995     window.attachEvent("onunload", destroyCache);
   3996   }
   3997 
   3998   // Safari has a dummy event handler on page unload so that it won't
   3999   // use its bfcache. Safari <= 3.1 has an issue with restoring the "document"
   4000   // object when page is returned to via the back button using its bfcache.
   4001   if (Prototype.Browser.WebKit) {
   4002     window.addEventListener('unload', Prototype.emptyFunction, false);
   4003   }
   4004 
   4005   return {
   4006     observe: function(element, eventName, handler) {
   4007       element = $(element);
   4008       var name = getDOMEventName(eventName);
   4009 
   4010       var wrapper = createWrapper(element, eventName, handler);
   4011       if (!wrapper) return element;
   4012 
   4013       if (element.addEventListener) {
   4014         element.addEventListener(name, wrapper, false);
   4015       } else {
   4016         element.attachEvent("on" + name, wrapper);
   4017       }
   4018 
   4019       return element;
   4020     },
   4021 
   4022     stopObserving: function(element, eventName, handler) {
   4023       element = $(element);
   4024       var id = getEventID(element), name = getDOMEventName(eventName);
   4025 
   4026       if (!handler && eventName) {
   4027         getWrappersForEventName(id, eventName).each(function(wrapper) {
   4028           element.stopObserving(eventName, wrapper.handler);
   4029         });
   4030         return element;
   4031 
   4032       } else if (!eventName) {
   4033         Object.keys(getCacheForID(id)).each(function(eventName) {
   4034           element.stopObserving(eventName);
   4035         });
   4036         return element;
   4037       }
   4038 
   4039       var wrapper = findWrapper(id, eventName, handler);
   4040       if (!wrapper) return element;
   4041 
   4042       if (element.removeEventListener) {
   4043         element.removeEventListener(name, wrapper, false);
   4044       } else {
   4045         element.detachEvent("on" + name, wrapper);
   4046       }
   4047 
   4048       destroyWrapper(id, eventName, handler);
   4049 
   4050       return element;
   4051     },
   4052 
   4053     fire: function(element, eventName, memo) {
   4054       element = $(element);
   4055       if (element == document && document.createEvent && !element.dispatchEvent)
   4056         element = document.documentElement;
   4057 
   4058       var event;
   4059       if (document.createEvent) {
   4060         event = document.createEvent("HTMLEvents");
   4061         event.initEvent("dataavailable", true, true);
   4062       } else {
   4063         event = document.createEventObject();
   4064         event.eventType = "ondataavailable";
   4065       }
   4066 
   4067       event.eventName = eventName;
   4068       event.memo = memo || { };
   4069 
   4070       if (document.createEvent) {
   4071         element.dispatchEvent(event);
   4072       } else {
   4073         element.fireEvent(event.eventType, event);
   4074       }
   4075 
   4076       return Event.extend(event);
   4077     }
   4078   };
   4079 })());
   4080 
   4081 Object.extend(Event, Event.Methods);
   4082 
   4083 Element.addMethods({
   4084   fire:          Event.fire,
   4085   observe:       Event.observe,
   4086   stopObserving: Event.stopObserving
   4087 });
   4088 
   4089 Object.extend(document, {
   4090   fire:          Element.Methods.fire.methodize(),
   4091   observe:       Element.Methods.observe.methodize(),
   4092   stopObserving: Element.Methods.stopObserving.methodize(),
   4093   loaded:        false
   4094 });
   4095 
   4096 (function() {
   4097   /* Support for the DOMContentLoaded event is based on work by Dan Webb,
   4098      Matthias Miller, Dean Edwards and John Resig. */
   4099 
   4100   var timer;
   4101 
   4102   function fireContentLoadedEvent() {
   4103     if (document.loaded) return;
   4104     if (timer) window.clearInterval(timer);
   4105     document.fire("dom:loaded");
   4106     document.loaded = true;
   4107   }
   4108 
   4109   if (document.addEventListener) {
   4110     if (Prototype.Browser.WebKit) {
   4111       timer = window.setInterval(function() {
   4112         if (/loaded|complete/.test(document.readyState))
   4113           fireContentLoadedEvent();
   4114       }, 0);
   4115 
   4116       Event.observe(window, "load", fireContentLoadedEvent);
   4117 
   4118     } else {
   4119       document.addEventListener("DOMContentLoaded",
   4120         fireContentLoadedEvent, false);
   4121     }
   4122 
   4123   } else {
   4124     document.write("<script id=__onDOMContentLoaded defer src=//:><\/script>");
   4125     $("__onDOMContentLoaded").onreadystatechange = function() {
   4126       if (this.readyState == "complete") {
   4127         this.onreadystatechange = null;
   4128         fireContentLoadedEvent();
   4129       }
   4130     };
   4131   }
   4132 })();
   4133 /*------------------------------- DEPRECATED -------------------------------*/
   4134 
   4135 Hash.toQueryString = Object.toQueryString;
   4136 
   4137 var Toggle = { display: Element.toggle };
   4138 
   4139 Element.Methods.childOf = Element.Methods.descendantOf;
   4140 
   4141 var Insertion = {
   4142   Before: function(element, content) {
   4143     return Element.insert(element, {before:content});
   4144   },
   4145 
   4146   Top: function(element, content) {
   4147     return Element.insert(element, {top:content});
   4148   },
   4149 
   4150   Bottom: function(element, content) {
   4151     return Element.insert(element, {bottom:content});
   4152   },
   4153 
   4154   After: function(element, content) {
   4155     return Element.insert(element, {after:content});
   4156   }
   4157 };
   4158 
   4159 var $continue = new Error('"throw $continue" is deprecated, use "return" instead');
   4160 
   4161 // This should be moved to script.aculo.us; notice the deprecated methods
   4162 // further below, that map to the newer Element methods.
   4163 var Position = {
   4164   // set to true if needed, warning: firefox performance problems
   4165   // NOT neeeded for page scrolling, only if draggable contained in
   4166   // scrollable elements
   4167   includeScrollOffsets: false,
   4168 
   4169   // must be called before calling withinIncludingScrolloffset, every time the
   4170   // page is scrolled
   4171   prepare: function() {
   4172     this.deltaX =  window.pageXOffset
   4173                 || document.documentElement.scrollLeft
   4174                 || document.body.scrollLeft
   4175                 || 0;
   4176     this.deltaY =  window.pageYOffset
   4177                 || document.documentElement.scrollTop
   4178                 || document.body.scrollTop
   4179                 || 0;
   4180   },
   4181 
   4182   // caches x/y coordinate pair to use with overlap
   4183   within: function(element, x, y) {
   4184     if (this.includeScrollOffsets)
   4185       return this.withinIncludingScrolloffsets(element, x, y);
   4186     this.xcomp = x;
   4187     this.ycomp = y;
   4188     this.offset = Element.cumulativeOffset(element);
   4189 
   4190     return (y >= this.offset[1] &&
   4191             y <  this.offset[1] + element.offsetHeight &&
   4192             x >= this.offset[0] &&
   4193             x <  this.offset[0] + element.offsetWidth);
   4194   },
   4195 
   4196   withinIncludingScrolloffsets: function(element, x, y) {
   4197     var offsetcache = Element.cumulativeScrollOffset(element);
   4198 
   4199     this.xcomp = x + offsetcache[0] - this.deltaX;
   4200     this.ycomp = y + offsetcache[1] - this.deltaY;
   4201     this.offset = Element.cumulativeOffset(element);
   4202 
   4203     return (this.ycomp >= this.offset[1] &&
   4204             this.ycomp <  this.offset[1] + element.offsetHeight &&
   4205             this.xcomp >= this.offset[0] &&
   4206             this.xcomp <  this.offset[0] + element.offsetWidth);
   4207   },
   4208 
   4209   // within must be called directly before
   4210   overlap: function(mode, element) {
   4211     if (!mode) return 0;
   4212     if (mode == 'vertical')
   4213       return ((this.offset[1] + element.offsetHeight) - this.ycomp) /
   4214         element.offsetHeight;
   4215     if (mode == 'horizontal')
   4216       return ((this.offset[0] + element.offsetWidth) - this.xcomp) /
   4217         element.offsetWidth;
   4218   },
   4219 
   4220   // Deprecation layer -- use newer Element methods now (1.5.2).
   4221 
   4222   cumulativeOffset: Element.Methods.cumulativeOffset,
   4223 
   4224   positionedOffset: Element.Methods.positionedOffset,
   4225 
   4226   absolutize: function(element) {
   4227     Position.prepare();
   4228     return Element.absolutize(element);
   4229   },
   4230 
   4231   relativize: function(element) {
   4232     Position.prepare();
   4233     return Element.relativize(element);
   4234   },
   4235 
   4236   realOffset: Element.Methods.cumulativeScrollOffset,
   4237 
   4238   offsetParent: Element.Methods.getOffsetParent,
   4239 
   4240   page: Element.Methods.viewportOffset,
   4241 
   4242   clone: function(source, target, options) {
   4243     options = options || { };
   4244     return Element.clonePosition(target, source, options);
   4245   }
   4246 };
   4247 
   4248 /*--------------------------------------------------------------------------*/
   4249 
   4250 if (!document.getElementsByClassName) document.getElementsByClassName = function(instanceMethods){
   4251   function iter(name) {
   4252     return name.blank() ? null : "[contains(concat(' ', @class, ' '), ' " + name + " ')]";
   4253   }
   4254 
   4255   instanceMethods.getElementsByClassName = Prototype.BrowserFeatures.XPath ?
   4256   function(element, className) {
   4257     className = className.toString().strip();
   4258     var cond = /\s/.test(className) ? $w(className).map(iter).join('') : iter(className);
   4259     return cond ? document._getElementsByXPath('.//*' + cond, element) : [];
   4260   } : function(element, className) {
   4261     className = className.toString().strip();
   4262     var elements = [], classNames = (/\s/.test(className) ? $w(className) : null);
   4263     if (!classNames && !className) return elements;
   4264 
   4265     var nodes = $(element).getElementsByTagName('*');
   4266     className = ' ' + className + ' ';
   4267 
   4268     for (var i = 0, child, cn; child = nodes[i]; i++) {
   4269       if (child.className && (cn = ' ' + child.className + ' ') && (cn.include(className) ||
   4270           (classNames && classNames.all(function(name) {
   4271             return !name.toString().blank() && cn.include(' ' + name + ' ');
   4272           }))))
   4273         elements.push(Element.extend(child));
   4274     }
   4275     return elements;
   4276   };
   4277 
   4278   return function(className, parentElement) {
   4279     return $(parentElement || document.body).getElementsByClassName(className);
   4280   };
   4281 }(Element.Methods);
   4282 
   4283 /*--------------------------------------------------------------------------*/
   4284 
   4285 Element.ClassNames = Class.create();
   4286 Element.ClassNames.prototype = {
   4287   initialize: function(element) {
   4288     this.element = $(element);
   4289   },
   4290 
   4291   _each: function(iterator) {
   4292     this.element.className.split(/\s+/).select(function(name) {
   4293       return name.length > 0;
   4294     })._each(iterator);
   4295   },
   4296 
   4297   set: function(className) {
   4298     this.element.className = className;
   4299   },
   4300 
   4301   add: function(classNameToAdd) {
   4302     if (this.include(classNameToAdd)) return;
   4303     this.set($A(this).concat(classNameToAdd).join(' '));
   4304   },
   4305 
   4306   remove: function(classNameToRemove) {
   4307     if (!this.include(classNameToRemove)) return;
   4308     this.set($A(this).without(classNameToRemove).join(' '));
   4309   },
   4310 
   4311   toString: function() {
   4312     return $A(this).join(' ');
   4313   }
   4314 };
   4315 
   4316 Object.extend(Element.ClassNames.prototype, Enumerable);
   4317 
   4318 /*--------------------------------------------------------------------------*/
   4319 
   4320 Element.addMethods();
   4321