1/*  Prototype JavaScript framework, version 1.6.0.2
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
9var Prototype = {
10  Version: '1.6.0.2',
11
12  Browser: {
13    IE:     !!(window.attachEvent && !window.opera),
14    Opera:  !!window.opera,
15    WebKit: navigator.userAgent.indexOf('AppleWebKit/') > -1,
16    Gecko:  navigator.userAgent.indexOf('Gecko') > -1 && navigator.userAgent.indexOf('KHTML') == -1,
17    MobileSafari: !!navigator.userAgent.match(/Apple.*Mobile.*Safari/)
18  },
19
20  BrowserFeatures: {
21    XPath: !!document.evaluate,
22    ElementExtensions: !!window.HTMLElement,
23    SpecificElementExtensions:
24      document.createElement('div').__proto__ &&
25      document.createElement('div').__proto__ !==
26        document.createElement('form').__proto__
27  },
28
29  ScriptFragment: '<script[^>]*>([\\S\\s]*?)<\/script>',
30  JSONFilter: /^\/\*-secure-([\s\S]*)\*\/\s*$/,
31
32  emptyFunction: function() { },
33  K: function(x) { return x }
34};
35
36if (Prototype.Browser.MobileSafari)
37  Prototype.BrowserFeatures.SpecificElementExtensions = false;
38
39
40/* Based on Alex Arnell's inheritance implementation. */
41var Class = {
42  create: function() {
43    var parent = null, properties = $A(arguments);
44    if (Object.isFunction(properties[0]))
45      parent = properties.shift();
46
47    function klass() {
48      this.initialize.apply(this, arguments);
49    }
50
51    Object.extend(klass, Class.Methods);
52    klass.superclass = parent;
53    klass.subclasses = [];
54
55    if (parent) {
56      var subclass = function() { };
57      subclass.prototype = parent.prototype;
58      klass.prototype = new subclass;
59      parent.subclasses.push(klass);
60    }
61
62    for (var i = 0; i < properties.length; i++)
63      klass.addMethods(properties[i]);
64
65    if (!klass.prototype.initialize)
66      klass.prototype.initialize = Prototype.emptyFunction;
67
68    klass.prototype.constructor = klass;
69
70    return klass;
71  }
72};
73
74Class.Methods = {
75  addMethods: function(source) {
76    var ancestor   = this.superclass && this.superclass.prototype;
77    var properties = Object.keys(source);
78
79    if (!Object.keys({ toString: true }).length)
80      properties.push("toString", "valueOf");
81
82    for (var i = 0, length = properties.length; i < length; i++) {
83      var property = properties[i], value = source[property];
84      if (ancestor && Object.isFunction(value) &&
85          value.argumentNames().first() == "$super") {
86        var method = value, value = Object.extend((function(m) {
87          return function() { return ancestor[m].apply(this, arguments) };
88        })(property).wrap(method), {
89          valueOf:  function() { return method },
90          toString: function() { return method.toString() }
91        });
92      }
93      this.prototype[property] = value;
94    }
95
96    return this;
97  }
98};
99
100var Abstract = { };
101
102Object.extend = function(destination, source) {
103  for (var property in source)
104    destination[property] = source[property];
105  return destination;
106};
107
108Object.extend(Object, {
109  inspect: function(object) {
110    try {
111      if (Object.isUndefined(object)) return 'undefined';
112      if (object === null) return 'null';
113      return object.inspect ? object.inspect() : String(object);
114    } catch (e) {
115      if (e instanceof RangeError) return '...';
116      throw e;
117    }
118  },
119
120  toJSON: function(object) {
121    var type = typeof object;
122    switch (type) {
123      case 'undefined':
124      case 'function':
125      case 'unknown': return;
126      case 'boolean': return object.toString();
127    }
128
129    if (object === null) return 'null';
130    if (object.toJSON) return object.toJSON();
131    if (Object.isElement(object)) return;
132
133    var results = [];
134    for (var property in object) {
135      var value = Object.toJSON(object[property]);
136      if (!Object.isUndefined(value))
137        results.push(property.toJSON() + ': ' + value);
138    }
139
140    return '{' + results.join(', ') + '}';
141  },
142
143  toQueryString: function(object) {
144    return $H(object).toQueryString();
145  },
146
147  toHTML: function(object) {
148    return object && object.toHTML ? object.toHTML() : String.interpret(object);
149  },
150
151  keys: function(object) {
152    var keys = [];
153    for (var property in object)
154      keys.push(property);
155    return keys;
156  },
157
158  values: function(object) {
159    var values = [];
160    for (var property in object)
161      values.push(object[property]);
162    return values;
163  },
164
165  clone: function(object) {
166    return Object.extend({ }, object);
167  },
168
169  isElement: function(object) {
170    return object && object.nodeType == 1;
171  },
172
173  isArray: function(object) {
174    return object != null && typeof object == "object" &&
175      'splice' in object && 'join' in object;
176  },
177
178  isHash: function(object) {
179    return object instanceof Hash;
180  },
181
182  isFunction: function(object) {
183    return typeof object == "function";
184  },
185
186  isString: function(object) {
187    return typeof object == "string";
188  },
189
190  isNumber: function(object) {
191    return typeof object == "number";
192  },
193
194  isUndefined: function(object) {
195    return typeof object == "undefined";
196  }
197});
198
199Object.extend(Function.prototype, {
200  argumentNames: function() {
201    var names = this.toString().match(/^[\s\(]*function[^(]*\((.*?)\)/)[1].split(",").invoke("strip");
202    return names.length == 1 && !names[0] ? [] : names;
203  },
204
205  bind: function() {
206    if (arguments.length < 2 && Object.isUndefined(arguments[0])) return this;
207    var __method = this, args = $A(arguments), object = args.shift();
208    return function() {
209      return __method.apply(object, args.concat($A(arguments)));
210    }
211  },
212
213  bindAsEventListener: function() {
214    var __method = this, args = $A(arguments), object = args.shift();
215    return function(event) {
216      return __method.apply(object, [event || window.event].concat(args));
217    }
218  },
219
220  curry: function() {
221    if (!arguments.length) return this;
222    var __method = this, args = $A(arguments);
223    return function() {
224      return __method.apply(this, args.concat($A(arguments)));
225    }
226  },
227
228  delay: function() {
229    var __method = this, args = $A(arguments), timeout = args.shift() * 1000;
230    return window.setTimeout(function() {
231      return __method.apply(__method, args);
232    }, timeout);
233  },
234
235  wrap: function(wrapper) {
236    var __method = this;
237    return function() {
238      return wrapper.apply(this, [__method.bind(this)].concat($A(arguments)));
239    }
240  },
241
242  methodize: function() {
243    if (this._methodized) return this._methodized;
244    var __method = this;
245    return this._methodized = function() {
246      return __method.apply(null, [this].concat($A(arguments)));
247    };
248  }
249});
250
251Function.prototype.defer = Function.prototype.delay.curry(0.01);
252
253Date.prototype.toJSON = function() {
254  return '"' + this.getUTCFullYear() + '-' +
255    (this.getUTCMonth() + 1).toPaddedString(2) + '-' +
256    this.getUTCDate().toPaddedString(2) + 'T' +
257    this.getUTCHours().toPaddedString(2) + ':' +
258    this.getUTCMinutes().toPaddedString(2) + ':' +
259    this.getUTCSeconds().toPaddedString(2) + 'Z"';
260};
261
262var Try = {
263  these: function() {
264    var returnValue;
265
266    for (var i = 0, length = arguments.length; i < length; i++) {
267      var lambda = arguments[i];
268      try {
269        returnValue = lambda();
270        break;
271      } catch (e) { }
272    }
273
274    return returnValue;
275  }
276};
277
278RegExp.prototype.match = RegExp.prototype.test;
279
280RegExp.escape = function(str) {
281  return String(str).replace(/([.*+?^=!:${}()|[\]\/\\])/g, '\\$1');
282};
283
284/*--------------------------------------------------------------------------*/
285
286var PeriodicalExecuter = Class.create({
287  initialize: function(callback, frequency) {
288    this.callback = callback;
289    this.frequency = frequency;
290    this.currentlyExecuting = false;
291
292    this.registerCallback();
293  },
294
295  registerCallback: function() {
296    this.timer = setInterval(this.onTimerEvent.bind(this), this.frequency * 1000);
297  },
298
299  execute: function() {
300    this.callback(this);
301  },
302
303  stop: function() {
304    if (!this.timer) return;
305    clearInterval(this.timer);
306    this.timer = null;
307  },
308
309  onTimerEvent: function() {
310    if (!this.currentlyExecuting) {
311      try {
312        this.currentlyExecuting = true;
313        this.execute();
314      } finally {
315        this.currentlyExecuting = false;
316      }
317    }
318  }
319});
320Object.extend(String, {
321  interpret: function(value) {
322    return value == null ? '' : String(value);
323  },
324  specialChar: {
325    '\b': '\\b',
326    '\t': '\\t',
327    '\n': '\\n',
328    '\f': '\\f',
329    '\r': '\\r',
330    '\\': '\\\\'
331  }
332});
333
334Object.extend(String.prototype, {
335  gsub: function(pattern, replacement) {
336    var result = '', source = this, match;
337    replacement = arguments.callee.prepareReplacement(replacement);
338
339    while (source.length > 0) {
340      if (match = source.match(pattern)) {
341        result += source.slice(0, match.index);
342        result += String.interpret(replacement(match));
343        source  = source.slice(match.index + match[0].length);
344      } else {
345        result += source, source = '';
346      }
347    }
348    return result;
349  },
350
351  sub: function(pattern, replacement, count) {
352    replacement = this.gsub.prepareReplacement(replacement);
353    count = Object.isUndefined(count) ? 1 : count;
354
355    return this.gsub(pattern, function(match) {
356      if (--count < 0) return match[0];
357      return replacement(match);
358    });
359  },
360
361  scan: function(pattern, iterator) {
362    this.gsub(pattern, iterator);
363    return String(this);
364  },
365
366  truncate: function(length, truncation) {
367    length = length || 30;
368    truncation = Object.isUndefined(truncation) ? '...' : truncation;
369    return this.length > length ?
370      this.slice(0, length - truncation.length) + truncation : String(this);
371  },
372
373  strip: function() {
374    return this.replace(/^\s+/, '').replace(/\s+$/, '');
375  },
376
377  stripTags: function() {
378    return this.replace(/<\/?[^>]+>/gi, '');
379  },
380
381  stripScripts: function() {
382    return this.replace(new RegExp(Prototype.ScriptFragment, 'img'), '');
383  },
384
385  extractScripts: function() {
386    var matchAll = new RegExp(Prototype.ScriptFragment, 'img');
387    var matchOne = new RegExp(Prototype.ScriptFragment, 'im');
388    return (this.match(matchAll) || []).map(function(scriptTag) {
389      return (scriptTag.match(matchOne) || ['', ''])[1];
390    });
391  },
392
393  evalScripts: function() {
394    return this.extractScripts().map(function(script) { return eval(script) });
395  },
396
397  escapeHTML: function() {
398    var self = arguments.callee;
399    self.text.data = this;
400    return self.div.innerHTML;
401  },
402
403  unescapeHTML: function() {
404    var div = new Element('div');
405    div.innerHTML = this.stripTags();
406    return div.childNodes[0] ? (div.childNodes.length > 1 ?
407      $A(div.childNodes).inject('', function(memo, node) { return memo+node.nodeValue }) :
408      div.childNodes[0].nodeValue) : '';
409  },
410
411  toQueryParams: function(separator) {
412    var match = this.strip().match(/([^?#]*)(#.*)?$/);
413    if (!match) return { };
414
415    return match[1].split(separator || '&').inject({ }, function(hash, pair) {
416      if ((pair = pair.split('='))[0]) {
417        var key = decodeURIComponent(pair.shift());
418        var value = pair.length > 1 ? pair.join('=') : pair[0];
419        if (value != undefined) value = decodeURIComponent(value);
420
421        if (key in hash) {
422          if (!Object.isArray(hash[key])) hash[key] = [hash[key]];
423          hash[key].push(value);
424        }
425        else hash[key] = value;
426      }
427      return hash;
428    });
429  },
430
431  toArray: function() {
432    return this.split('');
433  },
434
435  succ: function() {
436    return this.slice(0, this.length - 1) +
437      String.fromCharCode(this.charCodeAt(this.length - 1) + 1);
438  },
439
440  times: function(count) {
441    return count < 1 ? '' : new Array(count + 1).join(this);
442  },
443
444  camelize: function() {
445    var parts = this.split('-'), len = parts.length;
446    if (len == 1) return parts[0];
447
448    var camelized = this.charAt(0) == '-'
449      ? parts[0].charAt(0).toUpperCase() + parts[0].substring(1)
450      : parts[0];
451
452    for (var i = 1; i < len; i++)
453      camelized += parts[i].charAt(0).toUpperCase() + parts[i].substring(1);
454
455    return camelized;
456  },
457
458  capitalize: function() {
459    return this.charAt(0).toUpperCase() + this.substring(1).toLowerCase();
460  },
461
462  underscore: function() {
463    return this.gsub(/::/, '/').gsub(/([A-Z]+)([A-Z][a-z])/,'#{1}_#{2}').gsub(/([a-z\d])([A-Z])/,'#{1}_#{2}').gsub(/-/,'_').toLowerCase();
464  },
465
466  dasherize: function() {
467    return this.gsub(/_/,'-');
468  },
469
470  inspect: function(useDoubleQuotes) {
471    var escapedString = this.gsub(/[\x00-\x1f\\]/, function(match) {
472      var character = String.specialChar[match[0]];
473      return character ? character : '\\u00' + match[0].charCodeAt().toPaddedString(2, 16);
474    });
475    if (useDoubleQuotes) return '"' + escapedString.replace(/"/g, '\\"') + '"';
476    return "'" + escapedString.replace(/'/g, '\\\'') + "'";
477  },
478
479  toJSON: function() {
480    return this.inspect(true);
481  },
482
483  unfilterJSON: function(filter) {
484    return this.sub(filter || Prototype.JSONFilter, '#{1}');
485  },
486
487  isJSON: function() {
488    var str = this;
489    if (str.blank()) return false;
490    str = this.replace(/\\./g, '@').replace(/"[^"\\\n\r]*"/g, '');
491    return (/^[,:{}\[\]0-9.\-+Eaeflnr-u \n\r\t]*$/).test(str);
492  },
493
494  evalJSON: function(sanitize) {
495    var json = this.unfilterJSON();
496    try {
497      if (!sanitize || json.isJSON()) return eval('(' + json + ')');
498    } catch (e) { }
499    throw new SyntaxError('Badly formed JSON string: ' + this.inspect());
500  },
501
502  include: function(pattern) {
503    return this.indexOf(pattern) > -1;
504  },
505
506  startsWith: function(pattern) {
507    return this.indexOf(pattern) === 0;
508  },
509
510  endsWith: function(pattern) {
511    var d = this.length - pattern.length;
512    return d >= 0 && this.lastIndexOf(pattern) === d;
513  },
514
515  empty: function() {
516    return this == '';
517  },
518
519  blank: function() {
520    return /^\s*$/.test(this);
521  },
522
523  interpolate: function(object, pattern) {
524    return new Template(this, pattern).evaluate(object);
525  }
526});
527
528if (Prototype.Browser.WebKit || Prototype.Browser.IE) Object.extend(String.prototype, {
529  escapeHTML: function() {
530    return this.replace(/&/g,'&amp;').replace(/</g,'&lt;').replace(/>/g,'&gt;');
531  },
532  unescapeHTML: function() {
533    return this.replace(/&amp;/g,'&').replace(/&lt;/g,'<').replace(/&gt;/g,'>');
534  }
535});
536
537String.prototype.gsub.prepareReplacement = function(replacement) {
538  if (Object.isFunction(replacement)) return replacement;
539  var template = new Template(replacement);
540  return function(match) { return template.evaluate(match) };
541};
542
543String.prototype.parseQuery = String.prototype.toQueryParams;
544
545Object.extend(String.prototype.escapeHTML, {
546  div:  document.createElement('div'),
547  text: document.createTextNode('')
548});
549
550with (String.prototype.escapeHTML) div.appendChild(text);
551
552var Template = Class.create({
553  initialize: function(template, pattern) {
554    this.template = template.toString();
555    this.pattern = pattern || Template.Pattern;
556  },
557
558  evaluate: function(object) {
559    if (Object.isFunction(object.toTemplateReplacements))
560      object = object.toTemplateReplacements();
561
562    return this.template.gsub(this.pattern, function(match) {
563      if (object == null) return '';
564
565      var before = match[1] || '';
566      if (before == '\\') return match[2];
567
568      var ctx = object, expr = match[3];
569      var pattern = /^([^.[]+|\[((?:.*?[^\\])?)\])(\.|\[|$)/;
570      match = pattern.exec(expr);
571      if (match == null) return before;
572
573      while (match != null) {
574        var comp = match[1].startsWith('[') ? match[2].gsub('\\\\]', ']') : match[1];
575        ctx = ctx[comp];
576        if (null == ctx || '' == match[3]) break;
577        expr = expr.substring('[' == match[3] ? match[1].length : match[0].length);
578        match = pattern.exec(expr);
579      }
580
581      return before + String.interpret(ctx);
582    });
583  }
584});
585Template.Pattern = /(^|.|\r|\n)(#\{(.*?)\})/;
586
587var $break = { };
588
589var Enumerable = {
590  each: function(iterator, context) {
591    var index = 0;
592    iterator = iterator.bind(context);
593    try {
594      this._each(function(value) {
595        iterator(value, index++);
596      });
597    } catch (e) {
598      if (e != $break) throw e;
599    }
600    return this;
601  },
602
603  eachSlice: function(number, iterator, context) {
604    iterator = iterator ? iterator.bind(context) : Prototype.K;
605    var index = -number, slices = [], array = this.toArray();
606    while ((index += number) < array.length)
607      slices.push(array.slice(index, index+number));
608    return slices.collect(iterator, context);
609  },
610
611  all: function(iterator, context) {
612    iterator = iterator ? iterator.bind(context) : Prototype.K;
613    var result = true;
614    this.each(function(value, index) {
615      result = result && !!iterator(value, index);
616      if (!result) throw $break;
617    });
618    return result;
619  },
620
621  any: function(iterator, context) {
622    iterator = iterator ? iterator.bind(context) : Prototype.K;
623    var result = false;
624    this.each(function(value, index) {
625      if (result = !!iterator(value, index))
626        throw $break;
627    });
628    return result;
629  },
630
631  collect: function(iterator, context) {
632    iterator = iterator ? iterator.bind(context) : Prototype.K;
633    var results = [];
634    this.each(function(value, index) {
635      results.push(iterator(value, index));
636    });
637    return results;
638  },
639
640  detect: function(iterator, context) {
641    iterator = iterator.bind(context);
642    var result;
643    this.each(function(value, index) {
644      if (iterator(value, index)) {
645        result = value;
646        throw $break;
647      }
648    });
649    return result;
650  },
651
652  findAll: function(iterator, context) {
653    iterator = iterator.bind(context);
654    var results = [];
655    this.each(function(value, index) {
656      if (iterator(value, index))
657        results.push(value);
658    });
659    return results;
660  },
661
662  grep: function(filter, iterator, context) {
663    iterator = iterator ? iterator.bind(context) : Prototype.K;
664    var results = [];
665
666    if (Object.isString(filter))
667      filter = new RegExp(filter);
668
669    this.each(function(value, index) {
670      if (filter.match(value))
671        results.push(iterator(value, index));
672    });
673    return results;
674  },
675
676  include: function(object) {
677    if (Object.isFunction(this.indexOf))
678      if (this.indexOf(object) != -1) return true;
679
680    var found = false;
681    this.each(function(value) {
682      if (value == object) {
683        found = true;
684        throw $break;
685      }
686    });
687    return found;
688  },
689
690  inGroupsOf: function(number, fillWith) {
691    fillWith = Object.isUndefined(fillWith) ? null : fillWith;
692    return this.eachSlice(number, function(slice) {
693      while(slice.length < number) slice.push(fillWith);
694      return slice;
695    });
696  },
697
698  inject: function(memo, iterator, context) {
699    iterator = iterator.bind(context);
700    this.each(function(value, index) {
701      memo = iterator(memo, value, index);
702    });
703    return memo;
704  },
705
706  invoke: function(method) {
707    var args = $A(arguments).slice(1);
708    return this.map(function(value) {
709      return value[method].apply(value, args);
710    });
711  },
712
713  max: function(iterator, context) {
714    iterator = iterator ? iterator.bind(context) : Prototype.K;
715    var result;
716    this.each(function(value, index) {
717      value = iterator(value, index);
718      if (result == null || value >= result)
719        result = value;
720    });
721    return result;
722  },
723
724  min: function(iterator, context) {
725    iterator = iterator ? iterator.bind(context) : Prototype.K;
726    var result;
727    this.each(function(value, index) {
728      value = iterator(value, index);
729      if (result == null || value < result)
730        result = value;
731    });
732    return result;
733  },
734
735  partition: function(iterator, context) {
736    iterator = iterator ? iterator.bind(context) : Prototype.K;
737    var trues = [], falses = [];
738    this.each(function(value, index) {
739      (iterator(value, index) ?
740        trues : falses).push(value);
741    });
742    return [trues, falses];
743  },
744
745  pluck: function(property) {
746    var results = [];
747    this.each(function(value) {
748      results.push(value[property]);
749    });
750    return results;
751  },
752
753  reject: function(iterator, context) {
754    iterator = iterator.bind(context);
755    var results = [];
756    this.each(function(value, index) {
757      if (!iterator(value, index))
758        results.push(value);
759    });
760    return results;
761  },
762
763  sortBy: function(iterator, context) {
764    iterator = iterator.bind(context);
765    return this.map(function(value, index) {
766      return {value: value, criteria: iterator(value, index)};
767    }).sort(function(left, right) {
768      var a = left.criteria, b = right.criteria;
769      return a < b ? -1 : a > b ? 1 : 0;
770    }).pluck('value');
771  },
772
773  toArray: function() {
774    return this.map();
775  },
776
777  zip: function() {
778    var iterator = Prototype.K, args = $A(arguments);
779    if (Object.isFunction(args.last()))
780      iterator = args.pop();
781
782    var collections = [this].concat(args).map($A);
783    return this.map(function(value, index) {
784      return iterator(collections.pluck(index));
785    });
786  },
787
788  size: function() {
789    return this.toArray().length;
790  },
791
792  inspect: function() {
793    return '#<Enumerable:' + this.toArray().inspect() + '>';
794  }
795};
796
797Object.extend(Enumerable, {
798  map:     Enumerable.collect,
799  find:    Enumerable.detect,
800  select:  Enumerable.findAll,
801  filter:  Enumerable.findAll,
802  member:  Enumerable.include,
803  entries: Enumerable.toArray,
804  every:   Enumerable.all,
805  some:    Enumerable.any
806});
807function $A(iterable) {
808  if (!iterable) return [];
809  if (iterable.toArray) return iterable.toArray();
810  var length = iterable.length || 0, results = new Array(length);
811  while (length--) results[length] = iterable[length];
812  return results;
813}
814
815if (Prototype.Browser.WebKit) {
816  $A = function(iterable) {
817    if (!iterable) return [];
818    if (!(Object.isFunction(iterable) && iterable == '[object NodeList]') &&
819        iterable.toArray) return iterable.toArray();
820    var length = iterable.length || 0, results = new Array(length);
821    while (length--) results[length] = iterable[length];
822    return results;
823  };
824}
825
826Array.from = $A;
827
828Object.extend(Array.prototype, Enumerable);
829
830if (!Array.prototype._reverse) Array.prototype._reverse = Array.prototype.reverse;
831
832Object.extend(Array.prototype, {
833  _each: function(iterator) {
834    for (var i = 0, length = this.length; i < length; i++)
835      iterator(this[i]);
836  },
837
838  clear: function() {
839    this.length = 0;
840    return this;
841  },
842
843  first: function() {
844    return this[0];
845  },
846
847  last: function() {
848    return this[this.length - 1];
849  },
850
851  compact: function() {
852    return this.select(function(value) {
853      return value != null;
854    });
855  },
856
857  flatten: function() {
858    return this.inject([], function(array, value) {
859      return array.concat(Object.isArray(value) ?
860        value.flatten() : [value]);
861    });
862  },
863
864  without: function() {
865    var values = $A(arguments);
866    return this.select(function(value) {
867      return !values.include(value);
868    });
869  },
870
871  reverse: function(inline) {
872    return (inline !== false ? this : this.toArray())._reverse();
873  },
874
875  reduce: function() {
876    return this.length > 1 ? this : this[0];
877  },
878
879  uniq: function(sorted) {
880    return this.inject([], function(array, value, index) {
881      if (0 == index || (sorted ? array.last() != value : !array.include(value)))
882        array.push(value);
883      return array;
884    });
885  },
886
887  intersect: function(array) {
888    return this.uniq().findAll(function(item) {
889      return array.detect(function(value) { return item === value });
890    });
891  },
892
893  clone: function() {
894    return [].concat(this);
895  },
896
897  size: function() {
898    return this.length;
899  },
900
901  inspect: function() {
902    return '[' + this.map(Object.inspect).join(', ') + ']';
903  },
904
905  toJSON: function() {
906    var results = [];
907    this.each(function(object) {
908      var value = Object.toJSON(object);
909      if (!Object.isUndefined(value)) results.push(value);
910    });
911    return '[' + results.join(', ') + ']';
912  }
913});
914
915// use native browser JS 1.6 implementation if available
916if (Object.isFunction(Array.prototype.forEach))
917  Array.prototype._each = Array.prototype.forEach;
918
919if (!Array.prototype.indexOf) Array.prototype.indexOf = function(item, i) {
920  i || (i = 0);
921  var length = this.length;
922  if (i < 0) i = length + i;
923  for (; i < length; i++)
924    if (this[i] === item) return i;
925  return -1;
926};
927
928if (!Array.prototype.lastIndexOf) Array.prototype.lastIndexOf = function(item, i) {
929  i = isNaN(i) ? this.length : (i < 0 ? this.length + i : i) + 1;
930  var n = this.slice(0, i).reverse().indexOf(item);
931  return (n < 0) ? n : i - n - 1;
932};
933
934Array.prototype.toArray = Array.prototype.clone;
935
936function $w(string) {
937  if (!Object.isString(string)) return [];
938  string = string.strip();
939  return string ? string.split(/\s+/) : [];
940}
941
942if (Prototype.Browser.Opera){
943  Array.prototype.concat = function() {
944    var array = [];
945    for (var i = 0, length = this.length; i < length; i++) array.push(this[i]);
946    for (var i = 0, length = arguments.length; i < length; i++) {
947      if (Object.isArray(arguments[i])) {
948        for (var j = 0, arrayLength = arguments[i].length; j < arrayLength; j++)
949          array.push(arguments[i][j]);
950      } else {
951        array.push(arguments[i]);
952      }
953    }
954    return array;
955  };
956}
957Object.extend(Number.prototype, {
958  toColorPart: function() {
959    return this.toPaddedString(2, 16);
960  },
961
962  succ: function() {
963    return this + 1;
964  },
965
966  times: function(iterator) {
967    $R(0, this, true).each(iterator);
968    return this;
969  },
970
971  toPaddedString: function(length, radix) {
972    var string = this.toString(radix || 10);
973    return '0'.times(length - string.length) + string;
974  },
975
976  toJSON: function() {
977    return isFinite(this) ? this.toString() : 'null';
978  }
979});
980
981$w('abs round ceil floor').each(function(method){
982  Number.prototype[method] = Math[method].methodize();
983});
984function $H(object) {
985  return new Hash(object);
986};
987
988var Hash = Class.create(Enumerable, (function() {
989
990  function toQueryPair(key, value) {
991    if (Object.isUndefined(value)) return key;
992    return key + '=' + encodeURIComponent(String.interpret(value));
993  }
994
995  return {
996    initialize: function(object) {
997      this._object = Object.isHash(object) ? object.toObject() : Object.clone(object);
998    },
999
1000    _each: function(iterator) {
1001      for (var key in this._object) {
1002        var value = this._object[key], pair = [key, value];
1003        pair.key = key;
1004        pair.value = value;
1005        iterator(pair);
1006      }
1007    },
1008
1009    set: function(key, value) {
1010      return this._object[key] = value;
1011    },
1012
1013    get: function(key) {
1014      return this._object[key];
1015    },
1016
1017    unset: function(key) {
1018      var value = this._object[key];
1019      delete this._object[key];
1020      return value;
1021    },
1022
1023    toObject: function() {
1024      return Object.clone(this._object);
1025    },
1026
1027    keys: function() {
1028      return this.pluck('key');
1029    },
1030
1031    values: function() {
1032      return this.pluck('value');
1033    },
1034
1035    index: function(value) {
1036      var match = this.detect(function(pair) {
1037        return pair.value === value;
1038      });
1039      return match && match.key;
1040    },
1041
1042    merge: function(object) {
1043      return this.clone().update(object);
1044    },
1045
1046    update: function(object) {
1047      return new Hash(object).inject(this, function(result, pair) {
1048        result.set(pair.key, pair.value);
1049        return result;
1050      });
1051    },
1052
1053    toQueryString: function() {
1054      return this.map(function(pair) {
1055        var key = encodeURIComponent(pair.key), values = pair.value;
1056
1057        if (values && typeof values == 'object') {
1058          if (Object.isArray(values))
1059            return values.map(toQueryPair.curry(key)).join('&');
1060        }
1061        return toQueryPair(key, values);
1062      }).join('&');
1063    },
1064
1065    inspect: function() {
1066      return '#<Hash:{' + this.map(function(pair) {
1067        return pair.map(Object.inspect).join(': ');
1068      }).join(', ') + '}>';
1069    },
1070
1071    toJSON: function() {
1072      return Object.toJSON(this.toObject());
1073    },
1074
1075    clone: function() {
1076      return new Hash(this);
1077    }
1078  }
1079})());
1080
1081Hash.prototype.toTemplateReplacements = Hash.prototype.toObject;
1082Hash.from = $H;
1083var ObjectRange = Class.create(Enumerable, {
1084  initialize: function(start, end, exclusive) {
1085    this.start = start;
1086    this.end = end;
1087    this.exclusive = exclusive;
1088  },
1089
1090  _each: function(iterator) {
1091    var value = this.start;
1092    while (this.include(value)) {
1093      iterator(value);
1094      value = value.succ();
1095    }
1096  },
1097
1098  include: function(value) {
1099    if (value < this.start)
1100      return false;
1101    if (this.exclusive)
1102      return value < this.end;
1103    return value <= this.end;
1104  }
1105});
1106
1107var $R = function(start, end, exclusive) {
1108  return new ObjectRange(start, end, exclusive);
1109};
1110
1111var Ajax = {
1112  getTransport: function() {
1113    return Try.these(
1114      function() {return new XMLHttpRequest()},
1115      function() {return new ActiveXObject('Msxml2.XMLHTTP')},
1116      function() {return new ActiveXObject('Microsoft.XMLHTTP')}
1117    ) || false;
1118  },
1119
1120  activeRequestCount: 0
1121};
1122
1123Ajax.Responders = {
1124  responders: [],
1125
1126  _each: function(iterator) {
1127    this.responders._each(iterator);
1128  },
1129
1130  register: function(responder) {
1131    if (!this.include(responder))
1132      this.responders.push(responder);
1133  },
1134
1135  unregister: function(responder) {
1136    this.responders = this.responders.without(responder);
1137  },
1138
1139  dispatch: function(callback, request, transport, json) {
1140    this.each(function(responder) {
1141      if (Object.isFunction(responder[callback])) {
1142        try {
1143          responder[callback].apply(responder, [request, transport, json]);
1144        } catch (e) { }
1145      }
1146    });
1147  }
1148};
1149
1150Object.extend(Ajax.Responders, Enumerable);
1151
1152Ajax.Responders.register({
1153  onCreate:   function() { Ajax.activeRequestCount++ },
1154  onComplete: function() { Ajax.activeRequestCount-- }
1155});
1156
1157Ajax.Base = Class.create({
1158  initialize: function(options) {
1159    this.options = {
1160      method:       'post',
1161      asynchronous: true,
1162      contentType:  'application/x-www-form-urlencoded',
1163      encoding:     'UTF-8',
1164      parameters:   '',
1165      evalJSON:     true,
1166      evalJS:       true
1167    };
1168    Object.extend(this.options, options || { });
1169
1170    this.options.method = this.options.method.toLowerCase();
1171
1172    if (Object.isString(this.options.parameters))
1173      this.options.parameters = this.options.parameters.toQueryParams();
1174    else if (Object.isHash(this.options.parameters))
1175      this.options.parameters = this.options.parameters.toObject();
1176  }
1177});
1178
1179Ajax.Request = Class.create(Ajax.Base, {
1180  _complete: false,
1181
1182  initialize: function($super, url, options) {
1183    $super(options);
1184    this.transport = Ajax.getTransport();
1185    this.request(url);
1186  },
1187
1188  request: function(url) {
1189    this.url = url;
1190    this.method = this.options.method;
1191    var params = Object.clone(this.options.parameters);
1192
1193    if (!['get', 'post'].include(this.method)) {
1194      // simulate other verbs over post
1195      params['_method'] = this.method;
1196      this.method = 'post';
1197    }
1198
1199    this.parameters = params;
1200
1201    if (params = Object.toQueryString(params)) {
1202      // when GET, append parameters to URL
1203      if (this.method == 'get')
1204        this.url += (this.url.include('?') ? '&' : '?') + params;
1205      else if (/Konqueror|Safari|KHTML/.test(navigator.userAgent))
1206        params += '&_=';
1207    }
1208
1209    try {
1210      var response = new Ajax.Response(this);
1211      if (this.options.onCreate) this.options.onCreate(response);
1212      Ajax.Responders.dispatch('onCreate', this, response);
1213
1214      this.transport.open(this.method.toUpperCase(), this.url,
1215        this.options.asynchronous);
1216
1217      if (this.options.asynchronous) this.respondToReadyState.bind(this).defer(1);
1218
1219      this.transport.onreadystatechange = this.onStateChange.bind(this);
1220      this.setRequestHeaders();
1221
1222      this.body = this.method == 'post' ? (this.options.postBody || params) : null;
1223      this.transport.send(this.body);
1224
1225      /* Force Firefox to handle ready state 4 for synchronous requests */
1226      if (!this.options.asynchronous && this.transport.overrideMimeType)
1227        this.onStateChange();
1228
1229    }
1230    catch (e) {
1231      this.dispatchException(e);
1232    }
1233  },
1234
1235  onStateChange: function() {
1236    var readyState = this.transport.readyState;
1237    if (readyState > 1 && !((readyState == 4) && this._complete))
1238      this.respondToReadyState(this.transport.readyState);
1239  },
1240
1241  setRequestHeaders: function() {
1242    var headers = {
1243      'X-Requested-With': 'XMLHttpRequest',
1244      'X-Prototype-Version': Prototype.Version,
1245      'Accept': 'text/javascript, text/html, application/xml, text/xml, */*'
1246    };
1247
1248    if (this.method == 'post') {
1249      headers['Content-type'] = this.options.contentType +
1250        (this.options.encoding ? '; charset=' + this.options.encoding : '');
1251
1252      /* Force "Connection: close" for older Mozilla browsers to work
1253       * around a bug where XMLHttpRequest sends an incorrect
1254       * Content-length header. See Mozilla Bugzilla #246651.
1255       */
1256      if (this.transport.overrideMimeType &&
1257          (navigator.userAgent.match(/Gecko\/(\d{4})/) || [0,2005])[1] < 2005)
1258            headers['Connection'] = 'close';
1259    }
1260
1261    // user-defined headers
1262    if (typeof this.options.requestHeaders == 'object') {
1263      var extras = this.options.requestHeaders;
1264
1265      if (Object.isFunction(extras.push))
1266        for (var i = 0, length = extras.length; i < length; i += 2)
1267          headers[extras[i]] = extras[i+1];
1268      else
1269        $H(extras).each(function(pair) { headers[pair.key] = pair.value });
1270    }
1271
1272    for (var name in headers)
1273      this.transport.setRequestHeader(name, headers[name]);
1274  },
1275
1276  success: function() {
1277    var status = this.getStatus();
1278    return !status || (status >= 200 && status < 300);
1279  },
1280
1281  getStatus: function() {
1282    try {
1283      return this.transport.status || 0;
1284    } catch (e) { return 0 }
1285  },
1286
1287  respondToReadyState: function(readyState) {
1288    var state = Ajax.Request.Events[readyState], response = new Ajax.Response(this);
1289
1290    if (state == 'Complete') {
1291      try {
1292        this._complete = true;
1293        (this.options['on' + response.status]
1294         || this.options['on' + (this.success() ? 'Success' : 'Failure')]
1295         || Prototype.emptyFunction)(response, response.headerJSON);
1296      } catch (e) {
1297        this.dispatchException(e);
1298      }
1299
1300      var contentType = response.getHeader('Content-type');
1301      if (this.options.evalJS == 'force'
1302          || (this.options.evalJS && this.isSameOrigin() && contentType
1303          && contentType.match(/^\s*(text|application)\/(x-)?(java|ecma)script(;.*)?\s*$/i)))
1304        this.evalResponse();
1305    }
1306
1307    try {
1308      (this.options['on' + state] || Prototype.emptyFunction)(response, response.headerJSON);
1309      Ajax.Responders.dispatch('on' + state, this, response, response.headerJSON);
1310    } catch (e) {
1311      this.dispatchException(e);
1312    }
1313
1314    if (state == 'Complete') {
1315      // avoid memory leak in MSIE: clean up
1316      this.transport.onreadystatechange = Prototype.emptyFunction;
1317    }
1318  },
1319
1320  isSameOrigin: function() {
1321    var m = this.url.match(/^\s*https?:\/\/[^\/]*/);
1322    return !m || (m[0] == '#{protocol}//#{domain}#{port}'.interpolate({
1323      protocol: location.protocol,
1324      domain: document.domain,
1325      port: location.port ? ':' + location.port : ''
1326    }));
1327  },
1328
1329  getHeader: function(name) {
1330    try {
1331      return this.transport.getResponseHeader(name) || null;
1332    } catch (e) { return null }
1333  },
1334
1335  evalResponse: function() {
1336    try {
1337      return eval((this.transport.responseText || '').unfilterJSON());
1338    } catch (e) {
1339      this.dispatchException(e);
1340    }
1341  },
1342
1343  dispatchException: function(exception) {
1344    (this.options.onException || Prototype.emptyFunction)(this, exception);
1345    Ajax.Responders.dispatch('onException', this, exception);
1346  }
1347});
1348
1349Ajax.Request.Events =
1350  ['Uninitialized', 'Loading', 'Loaded', 'Interactive', 'Complete'];
1351
1352Ajax.Response = Class.create({
1353  initialize: function(request){
1354    this.request = request;
1355    var transport  = this.transport  = request.transport,
1356        readyState = this.readyState = transport.readyState;
1357
1358    if((readyState > 2 && !Prototype.Browser.IE) || readyState == 4) {
1359      this.status       = this.getStatus();
1360      this.statusText   = this.getStatusText();
1361      this.responseText = String.interpret(transport.responseText);
1362      this.headerJSON   = this._getHeaderJSON();
1363    }
1364
1365    if(readyState == 4) {
1366      var xml = transport.responseXML;
1367      this.responseXML  = Object.isUndefined(xml) ? null : xml;
1368      this.responseJSON = this._getResponseJSON();
1369    }
1370  },
1371
1372  status:      0,
1373  statusText: '',
1374
1375  getStatus: Ajax.Request.prototype.getStatus,
1376
1377  getStatusText: function() {
1378    try {
1379      return this.transport.statusText || '';
1380    } catch (e) { return '' }
1381  },
1382
1383  getHeader: Ajax.Request.prototype.getHeader,
1384
1385  getAllHeaders: function() {
1386    try {
1387      return this.getAllResponseHeaders();
1388    } catch (e) { return null }
1389  },
1390
1391  getResponseHeader: function(name) {
1392    return this.transport.getResponseHeader(name);
1393  },
1394
1395  getAllResponseHeaders: function() {
1396    return this.transport.getAllResponseHeaders();
1397  },
1398
1399  _getHeaderJSON: function() {
1400    var json = this.getHeader('X-JSON');
1401    if (!json) return null;
1402    json = decodeURIComponent(escape(json));
1403    try {
1404      return json.evalJSON(this.request.options.sanitizeJSON ||
1405        !this.request.isSameOrigin());
1406    } catch (e) {
1407      this.request.dispatchException(e);
1408    }
1409  },
1410
1411  _getResponseJSON: function() {
1412    var options = this.request.options;
1413    if (!options.evalJSON || (options.evalJSON != 'force' &&
1414      !(this.getHeader('Content-type') || '').include('application/json')) ||
1415        this.responseText.blank())
1416          return null;
1417    try {
1418      return this.responseText.evalJSON(options.sanitizeJSON ||
1419        !this.request.isSameOrigin());
1420    } catch (e) {
1421      this.request.dispatchException(e);
1422    }
1423  }
1424});
1425
1426Ajax.Updater = Class.create(Ajax.Request, {
1427  initialize: function($super, container, url, options) {
1428    this.container = {
1429      success: (container.success || container),
1430      failure: (container.failure || (container.success ? null : container))
1431    };
1432
1433    options = Object.clone(options);
1434    var onComplete = options.onComplete;
1435    options.onComplete = (function(response, json) {
1436      this.updateContent(response.responseText);
1437      if (Object.isFunction(onComplete)) onComplete(response, json);
1438    }).bind(this);
1439
1440    $super(url, options);
1441  },
1442
1443  updateContent: function(responseText) {
1444    var receiver = this.container[this.success() ? 'success' : 'failure'],
1445        options = this.options;
1446
1447    if (!options.evalScripts) responseText = responseText.stripScripts();
1448
1449    if (receiver = $(receiver)) {
1450      if (options.insertion) {
1451        if (Object.isString(options.insertion)) {
1452          var insertion = { }; insertion[options.insertion] = responseText;
1453          receiver.insert(insertion);
1454        }
1455        else options.insertion(receiver, responseText);
1456      }
1457      else receiver.update(responseText);
1458    }
1459  }
1460});
1461
1462Ajax.PeriodicalUpdater = Class.create(Ajax.Base, {
1463  initialize: function($super, container, url, options) {
1464    $super(options);
1465    this.onComplete = this.options.onComplete;
1466
1467    this.frequency = (this.options.frequency || 2);
1468    this.decay = (this.options.decay || 1);
1469
1470    this.updater = { };
1471    this.container = container;
1472    this.url = url;
1473
1474    this.start();
1475  },
1476
1477  start: function() {
1478    this.options.onComplete = this.updateComplete.bind(this);
1479    this.onTimerEvent();
1480  },
1481
1482  stop: function() {
1483    this.updater.options.onComplete = undefined;
1484    clearTimeout(this.timer);
1485    (this.onComplete || Prototype.emptyFunction).apply(this, arguments);
1486  },
1487
1488  updateComplete: function(response) {
1489    if (this.options.decay) {
1490      this.decay = (response.responseText == this.lastText ?
1491        this.decay * this.options.decay : 1);
1492
1493      this.lastText = response.responseText;
1494    }
1495    this.timer = this.onTimerEvent.bind(this).delay(this.decay * this.frequency);
1496  },
1497
1498  onTimerEvent: function() {
1499    this.updater = new Ajax.Updater(this.container, this.url, this.options);
1500  }
1501});
1502function $(element) {
1503  if (arguments.length > 1) {
1504    for (var i = 0, elements = [], length = arguments.length; i < length; i++)
1505      elements.push($(arguments[i]));
1506    return elements;
1507  }
1508  if (Object.isString(element))
1509    element = document.getElementById(element);
1510  return Element.extend(element);
1511}
1512
1513if (Prototype.BrowserFeatures.XPath) {
1514  document._getElementsByXPath = function(expression, parentElement) {
1515    var results = [];
1516    var query = document.evaluate(expression, $(parentElement) || document,
1517      null, XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null);
1518    for (var i = 0, length = query.snapshotLength; i < length; i++)
1519      results.push(Element.extend(query.snapshotItem(i)));
1520    return results;
1521  };
1522}
1523
1524/*--------------------------------------------------------------------------*/
1525
1526if (!window.Node) var Node = { };
1527
1528if (!Node.ELEMENT_NODE) {
1529  // DOM level 2 ECMAScript Language Binding
1530  Object.extend(Node, {
1531    ELEMENT_NODE: 1,
1532    ATTRIBUTE_NODE: 2,
1533    TEXT_NODE: 3,
1534    CDATA_SECTION_NODE: 4,
1535    ENTITY_REFERENCE_NODE: 5,
1536    ENTITY_NODE: 6,
1537    PROCESSING_INSTRUCTION_NODE: 7,
1538    COMMENT_NODE: 8,
1539    DOCUMENT_NODE: 9,
1540    DOCUMENT_TYPE_NODE: 10,
1541    DOCUMENT_FRAGMENT_NODE: 11,
1542    NOTATION_NODE: 12
1543  });
1544}
1545
1546(function() {
1547  var element = this.Element;
1548  this.Element = function(tagName, attributes) {
1549    attributes = attributes || { };
1550    tagName = tagName.toLowerCase();
1551    var cache = Element.cache;
1552    if (Prototype.Browser.IE && attributes.name) {
1553      tagName = '<' + tagName + ' name="' + attributes.name + '">';
1554      delete attributes.name;
1555      return Element.writeAttribute(document.createElement(tagName), attributes);
1556    }
1557    if (!cache[tagName]) cache[tagName] = Element.extend(document.createElement(tagName));
1558    return Element.writeAttribute(cache[tagName].cloneNode(false), attributes);
1559  };
1560  Object.extend(this.Element, element || { });
1561}).call(window);
1562
1563Element.cache = { };
1564
1565Element.Methods = {
1566  visible: function(element) {
1567    return $(element).style.display != 'none';
1568  },
1569
1570  toggle: function(element) {
1571    element = $(element);
1572    Element[Element.visible(element) ? 'hide' : 'show'](element);
1573    return element;
1574  },
1575
1576  hide: function(element) {
1577    $(element).style.display = 'none';
1578    return element;
1579  },
1580
1581  show: function(element) {
1582    $(element).style.display = '';
1583    return element;
1584  },
1585
1586  remove: function(element) {
1587    element = $(element);
1588    element.parentNode.removeChild(element);
1589    return element;
1590  },
1591
1592  update: function(element, content) {
1593    element = $(element);
1594    if (content && content.toElement) content = content.toElement();
1595    if (Object.isElement(content)) return element.update().insert(content);
1596    content = Object.toHTML(content);
1597    element.innerHTML = content.stripScripts();
1598    content.evalScripts.bind(content).defer();
1599    return element;
1600  },
1601
1602  replace: function(element, content) {
1603    element = $(element);
1604    if (content && content.toElement) content = content.toElement();
1605    else if (!Object.isElement(content)) {
1606      content = Object.toHTML(content);
1607      var range = element.ownerDocument.createRange();
1608      range.selectNode(element);
1609      content.evalScripts.bind(content).defer();
1610      content = range.createContextualFragment(content.stripScripts());
1611    }
1612    element.parentNode.replaceChild(content, element);
1613    return element;
1614  },
1615
1616  insert: function(element, insertions) {
1617    element = $(element);
1618
1619    if (Object.isString(insertions) || Object.isNumber(insertions) ||
1620        Object.isElement(insertions) || (insertions && (insertions.toElement || insertions.toHTML)))
1621          insertions = {bottom:insertions};
1622
1623    var content, insert, tagName, childNodes;
1624
1625    for (var position in insertions) {
1626      content  = insertions[position];
1627      position = position.toLowerCase();
1628      insert = Element._insertionTranslations[position];
1629
1630      if (content && content.toElement) content = content.toElement();
1631      if (Object.isElement(content)) {
1632        insert(element, content);
1633        continue;
1634      }
1635
1636      content = Object.toHTML(content);
1637
1638      tagName = ((position == 'before' || position == 'after')
1639        ? element.parentNode : element).tagName.toUpperCase();
1640
1641      childNodes = Element._getContentFromAnonymousElement(tagName, content.stripScripts());
1642
1643      if (position == 'top' || position == 'after') childNodes.reverse();
1644      childNodes.each(insert.curry(element));
1645
1646      content.evalScripts.bind(content).defer();
1647    }
1648
1649    return element;
1650  },
1651
1652  wrap: function(element, wrapper, attributes) {
1653    element = $(element);
1654    if (Object.isElement(wrapper))
1655      $(wrapper).writeAttribute(attributes || { });
1656    else if (Object.isString(wrapper)) wrapper = new Element(wrapper, attributes);
1657    else wrapper = new Element('div', wrapper);
1658    if (element.parentNode)
1659      element.parentNode.replaceChild(wrapper, element);
1660    wrapper.appendChild(element);
1661    return wrapper;
1662  },
1663
1664  inspect: function(element) {
1665    element = $(element);
1666    var result = '<' + element.tagName.toLowerCase();
1667    $H({'id': 'id', 'className': 'class'}).each(function(pair) {
1668      var property = pair.first(), attribute = pair.last();
1669      var value = (element[property] || '').toString();
1670      if (value) result += ' ' + attribute + '=' + value.inspect(true);
1671    });
1672    return result + '>';
1673  },
1674
1675  recursivelyCollect: function(element, property) {
1676    element = $(element);
1677    var elements = [];
1678    while (element = element[property])
1679      if (element.nodeType == 1)
1680        elements.push(Element.extend(element));
1681    return elements;
1682  },
1683
1684  ancestors: function(element) {
1685    return $(element).recursivelyCollect('parentNode');
1686  },
1687
1688  descendants: function(element) {
1689    return $(element).select("*");
1690  },
1691
1692  firstDescendant: function(element) {
1693    element = $(element).firstChild;
1694    while (element && element.nodeType != 1) element = element.nextSibling;
1695    return $(element);
1696  },
1697
1698  immediateDescendants: function(element) {
1699    if (!(element = $(element).firstChild)) return [];
1700    while (element && element.nodeType != 1) element = element.nextSibling;
1701    if (element) return [element].concat($(element).nextSiblings());
1702    return [];
1703  },
1704
1705  previousSiblings: function(element) {
1706    return $(element).recursivelyCollect('previousSibling');
1707  },
1708
1709  nextSiblings: function(element) {
1710    return $(element).recursivelyCollect('nextSibling');
1711  },
1712
1713  siblings: function(element) {
1714    element = $(element);
1715    return element.previousSiblings().reverse().concat(element.nextSiblings());
1716  },
1717
1718  match: function(element, selector) {
1719    if (Object.isString(selector))
1720      selector = new Selector(selector);
1721    return selector.match($(element));
1722  },
1723
1724  up: function(element, expression, index) {
1725    element = $(element);
1726    if (arguments.length == 1) return $(element.parentNode);
1727    var ancestors = element.ancestors();
1728    return Object.isNumber(expression) ? ancestors[expression] :
1729      Selector.findElement(ancestors, expression, index);
1730  },
1731
1732  down: function(element, expression, index) {
1733    element = $(element);
1734    if (arguments.length == 1) return element.firstDescendant();
1735    return Object.isNumber(expression) ? element.descendants()[expression] :
1736      element.select(expression)[index || 0];
1737  },
1738
1739  previous: function(element, expression, index) {
1740    element = $(element);
1741    if (arguments.length == 1) return $(Selector.handlers.previousElementSibling(element));
1742    var previousSiblings = element.previousSiblings();
1743    return Object.isNumber(expression) ? previousSiblings[expression] :
1744      Selector.findElement(previousSiblings, expression, index);
1745  },
1746
1747  next: function(element, expression, index) {
1748    element = $(element);
1749    if (arguments.length == 1) return $(Selector.handlers.nextElementSibling(element));
1750    var nextSiblings = element.nextSiblings();
1751    return Object.isNumber(expression) ? nextSiblings[expression] :
1752      Selector.findElement(nextSiblings, expression, index);
1753  },
1754
1755  select: function() {
1756    var args = $A(arguments), element = $(args.shift());
1757    return Selector.findChildElements(element, args);
1758  },
1759
1760  adjacent: function() {
1761    var args = $A(arguments), element = $(args.shift());
1762    return Selector.findChildElements(element.parentNode, args).without(element);
1763  },
1764
1765  identify: function(element) {
1766    element = $(element);
1767    var id = element.readAttribute('id'), self = arguments.callee;
1768    if (id) return id;
1769    do { id = 'anonymous_element_' + self.counter++ } while ($(id));
1770    element.writeAttribute('id', id);
1771    return id;
1772  },
1773
1774  readAttribute: function(element, name) {
1775    element = $(element);
1776    if (Prototype.Browser.IE) {
1777      var t = Element._attributeTranslations.read;
1778      if (t.values[name]) return t.values[name](element, name);
1779      if (t.names[name]) name = t.names[name];
1780      if (name.include(':')) {
1781        return (!element.attributes || !element.attributes[name]) ? null :
1782         element.attributes[name].value;
1783      }
1784    }
1785    return element.getAttribute(name);
1786  },
1787
1788  writeAttribute: function(element, name, value) {
1789    element = $(element);
1790    var attributes = { }, t = Element._attributeTranslations.write;
1791
1792    if (typeof name == 'object') attributes = name;
1793    else attributes[name] = Object.isUndefined(value) ? true : value;
1794
1795    for (var attr in attributes) {
1796      name = t.names[attr] || attr;
1797      value = attributes[attr];
1798      if (t.values[attr]) name = t.values[attr](element, value);
1799      if (value === false || value === null)
1800        element.removeAttribute(name);
1801      else if (value === true)
1802        element.setAttribute(name, name);
1803      else element.setAttribute(name, value);
1804    }
1805    return element;
1806  },
1807
1808  getHeight: function(element) {
1809    return $(element).getDimensions().height;
1810  },
1811
1812  getWidth: function(element) {
1813    return $(element).getDimensions().width;
1814  },
1815
1816  classNames: function(element) {
1817    return new Element.ClassNames(element);
1818  },
1819
1820  hasClassName: function(element, className) {
1821    if (!(element = $(element))) return;
1822    var elementClassName = element.className;
1823    return (elementClassName.length > 0 && (elementClassName == className ||
1824      new RegExp("(^|\\s)" + className + "(\\s|$)").test(elementClassName)));
1825  },
1826
1827  addClassName: function(element, className) {
1828    if (!(element = $(element))) return;
1829    if (!element.hasClassName(className))
1830      element.className += (element.className ? ' ' : '') + className;
1831    return element;
1832  },
1833
1834  removeClassName: function(element, className) {
1835    if (!(element = $(element))) return;
1836    element.className = element.className.replace(
1837      new RegExp("(^|\\s+)" + className + "(\\s+|$)"), ' ').strip();
1838    return element;
1839  },
1840
1841  toggleClassName: function(element, className) {
1842    if (!(element = $(element))) return;
1843    return element[element.hasClassName(className) ?
1844      'removeClassName' : 'addClassName'](className);
1845  },
1846
1847  // removes whitespace-only text node children
1848  cleanWhitespace: function(element) {
1849    element = $(element);
1850    var node = element.firstChild;
1851    while (node) {
1852      var nextNode = node.nextSibling;
1853      if (node.nodeType == 3 && !/\S/.test(node.nodeValue))
1854        element.removeChild(node);
1855      node = nextNode;
1856    }
1857    return element;
1858  },
1859
1860  empty: function(element) {
1861    return $(element).innerHTML.blank();
1862  },
1863
1864  descendantOf: function(element, ancestor) {
1865    element = $(element), ancestor = $(ancestor);
1866    var originalAncestor = ancestor;
1867
1868    if (element.compareDocumentPosition)
1869      return (element.compareDocumentPosition(ancestor) & 8) === 8;
1870
1871    if (element.sourceIndex && !Prototype.Browser.Opera) {
1872      var e = element.sourceIndex, a = ancestor.sourceIndex,
1873       nextAncestor = ancestor.nextSibling;
1874      if (!nextAncestor) {
1875        do { ancestor = ancestor.parentNode; }
1876        while (!(nextAncestor = ancestor.nextSibling) && ancestor.parentNode);
1877      }
1878      if (nextAncestor && nextAncestor.sourceIndex)
1879       return (e > a && e < nextAncestor.sourceIndex);
1880    }
1881
1882    while (element = element.parentNode)
1883      if (element == originalAncestor) return true;
1884    return false;
1885  },
1886
1887  scrollTo: function(element) {
1888    element = $(element);
1889    var pos = element.cumulativeOffset();
1890    window.scrollTo(pos[0], pos[1]);
1891    return element;
1892  },
1893
1894  getStyle: function(element, style) {
1895    element = $(element);
1896    style = style == 'float' ? 'cssFloat' : style.camelize();
1897    var value = element.style[style];
1898    if (!value) {
1899      var css = document.defaultView.getComputedStyle(element, null);
1900      value = css ? css[style] : null;
1901    }
1902    if (style == 'opacity') return value ? parseFloat(value) : 1.0;
1903    return value == 'auto' ? null : value;
1904  },
1905
1906  getOpacity: function(element) {
1907    return $(element).getStyle('opacity');
1908  },
1909
1910  setStyle: function(element, styles) {
1911    element = $(element);
1912    var elementStyle = element.style, match;
1913    if (Object.isString(styles)) {
1914      element.style.cssText += ';' + styles;
1915      return styles.include('opacity') ?
1916        element.setOpacity(styles.match(/opacity:\s*(\d?\.?\d*)/)[1]) : element;
1917    }
1918    for (var property in styles)
1919      if (property == 'opacity') element.setOpacity(styles[property]);
1920      else
1921        elementStyle[(property == 'float' || property == 'cssFloat') ?
1922          (Object.isUndefined(elementStyle.styleFloat) ? 'cssFloat' : 'styleFloat') :
1923            property] = styles[property];
1924
1925    return element;
1926  },
1927
1928  setOpacity: function(element, value) {
1929    element = $(element);
1930    element.style.opacity = (value == 1 || value === '') ? '' :
1931      (value < 0.00001) ? 0 : value;
1932    return element;
1933  },
1934
1935  getDimensions: function(element) {
1936    element = $(element);
1937    var display = $(element).getStyle('display');
1938    if (display != 'none' && display != null) // Safari bug
1939      return {width: element.offsetWidth, height: element.offsetHeight};
1940
1941    // All *Width and *Height properties give 0 on elements with display none,
1942    // so enable the element temporarily
1943    var els = element.style;
1944    var originalVisibility = els.visibility;
1945    var originalPosition = els.position;
1946    var originalDisplay = els.display;
1947    els.visibility = 'hidden';
1948    els.position = 'absolute';
1949    els.display = 'block';
1950    var originalWidth = element.clientWidth;
1951    var originalHeight = element.clientHeight;
1952    els.display = originalDisplay;
1953    els.position = originalPosition;
1954    els.visibility = originalVisibility;
1955    return {width: originalWidth, height: originalHeight};
1956  },
1957
1958  makePositioned: function(element) {
1959    element = $(element);
1960    var pos = Element.getStyle(element, 'position');
1961    if (pos == 'static' || !pos) {
1962      element._madePositioned = true;
1963      element.style.position = 'relative';
1964      // Opera returns the offset relative to the positioning context, when an
1965      // element is position relative but top and left have not been defined
1966      if (window.opera) {
1967        element.style.top = 0;
1968        element.style.left = 0;
1969      }
1970    }
1971    return element;
1972  },
1973
1974  undoPositioned: function(element) {
1975    element = $(element);
1976    if (element._madePositioned) {
1977      element._madePositioned = undefined;
1978      element.style.position =
1979        element.style.top =
1980        element.style.left =
1981        element.style.bottom =
1982        element.style.right = '';
1983    }
1984    return element;
1985  },
1986
1987  makeClipping: function(element) {
1988    element = $(element);
1989    if (element._overflow) return element;
1990    element._overflow = Element.getStyle(element, 'overflow') || 'auto';
1991    if (element._overflow !== 'hidden')
1992      element.style.overflow = 'hidden';
1993    return element;
1994  },
1995
1996  undoClipping: function(element) {
1997    element = $(element);
1998    if (!element._overflow) return element;
1999    element.style.overflow = element._overflow == 'auto' ? '' : element._overflow;
2000    element._overflow = null;
2001    return element;
2002  },
2003
2004  cumulativeOffset: function(element) {
2005    var valueT = 0, valueL = 0;
2006    do {
2007      valueT += element.offsetTop  || 0;
2008      valueL += element.offsetLeft || 0;
2009      element = element.offsetParent;
2010    } while (element);
2011    return Element._returnOffset(valueL, valueT);
2012  },
2013
2014  positionedOffset: function(element) {
2015    var valueT = 0, valueL = 0;
2016    do {
2017      valueT += element.offsetTop  || 0;
2018      valueL += element.offsetLeft || 0;
2019      element = element.offsetParent;
2020      if (element) {
2021        if (element.tagName == 'BODY') break;
2022        var p = Element.getStyle(element, 'position');
2023        if (p !== 'static') break;
2024      }
2025    } while (element);
2026    return Element._returnOffset(valueL, valueT);
2027  },
2028
2029  absolutize: function(element) {
2030    element = $(element);
2031    if (element.getStyle('position') == 'absolute') return;
2032    // Position.prepare(); // To be done manually by Scripty when it needs it.
2033
2034    var offsets = element.positionedOffset();
2035    var top     = offsets[1];
2036    var left    = offsets[0];
2037    var width   = element.clientWidth;
2038    var height  = element.clientHeight;
2039
2040    element._originalLeft   = left - parseFloat(element.style.left  || 0);
2041    element._originalTop    = top  - parseFloat(element.style.top || 0);
2042    element._originalWidth  = element.style.width;
2043    element._originalHeight = element.style.height;
2044
2045    element.style.position = 'absolute';
2046    element.style.top    = top + 'px';
2047    element.style.left   = left + 'px';
2048    element.style.width  = width + 'px';
2049    element.style.height = height + 'px';
2050    return element;
2051  },
2052
2053  relativize: function(element) {
2054    element = $(element);
2055    if (element.getStyle('position') == 'relative') return;
2056    // Position.prepare(); // To be done manually by Scripty when it needs it.
2057
2058    element.style.position = 'relative';
2059    var top  = parseFloat(element.style.top  || 0) - (element._originalTop || 0);
2060    var left = parseFloat(element.style.left || 0) - (element._originalLeft || 0);
2061
2062    element.style.top    = top + 'px';
2063    element.style.left   = left + 'px';
2064    element.style.height = element._originalHeight;
2065    element.style.width  = element._originalWidth;
2066    return element;
2067  },
2068
2069  cumulativeScrollOffset: function(element) {
2070    var valueT = 0, valueL = 0;
2071    do {
2072      valueT += element.scrollTop  || 0;
2073      valueL += element.scrollLeft || 0;
2074      element = element.parentNode;
2075    } while (element);
2076    return Element._returnOffset(valueL, valueT);
2077  },
2078
2079  getOffsetParent: function(element) {
2080    if (element.offsetParent) return $(element.offsetParent);
2081    if (element == document.body) return $(element);
2082
2083    while ((element = element.parentNode) && element != document.body)
2084      if (Element.getStyle(element, 'position') != 'static')
2085        return $(element);
2086
2087    return $(document.body);
2088  },
2089
2090  viewportOffset: function(forElement) {
2091    var valueT = 0, valueL = 0;
2092
2093    var element = forElement;
2094    do {
2095      valueT += element.offsetTop  || 0;
2096      valueL += element.offsetLeft || 0;
2097
2098      // Safari fix
2099      if (element.offsetParent == document.body &&
2100        Element.getStyle(element, 'position') == 'absolute') break;
2101
2102    } while (element = element.offsetParent);
2103
2104    element = forElement;
2105    do {
2106      if (!Prototype.Browser.Opera || element.tagName == 'BODY') {
2107        valueT -= element.scrollTop  || 0;
2108        valueL -= element.scrollLeft || 0;
2109      }
2110    } while (element = element.parentNode);
2111
2112    return Element._returnOffset(valueL, valueT);
2113  },
2114
2115  clonePosition: function(element, source) {
2116    var options = Object.extend({
2117      setLeft:    true,
2118      setTop:     true,
2119      setWidth:   true,
2120      setHeight:  true,
2121      offsetTop:  0,
2122      offsetLeft: 0
2123    }, arguments[2] || { });
2124
2125    // find page position of source
2126    source = $(source);
2127    var p = source.viewportOffset();
2128
2129    // find coordinate system to use
2130    element = $(element);
2131    var delta = [0, 0];
2132    var parent = null;
2133    // delta [0,0] will do fine with position: fixed elements,
2134    // position:absolute needs offsetParent deltas
2135    if (Element.getStyle(element, 'position') == 'absolute') {
2136      parent = element.getOffsetParent();
2137      delta = parent.viewportOffset();
2138    }
2139
2140    // correct by body offsets (fixes Safari)
2141    if (parent == document.body) {
2142      delta[0] -= document.body.offsetLeft;
2143      delta[1] -= document.body.offsetTop;
2144    }
2145
2146    // set position
2147    if (options.setLeft)   element.style.left  = (p[0] - delta[0] + options.offsetLeft) + 'px';
2148    if (options.setTop)    element.style.top   = (p[1] - delta[1] + options.offsetTop) + 'px';
2149    if (options.setWidth)  element.style.width = source.offsetWidth + 'px';
2150    if (options.setHeight) element.style.height = source.offsetHeight + 'px';
2151    return element;
2152  }
2153};
2154
2155Element.Methods.identify.counter = 1;
2156
2157Object.extend(Element.Methods, {
2158  getElementsBySelector: Element.Methods.select,
2159  childElements: Element.Methods.immediateDescendants
2160});
2161
2162Element._attributeTranslations = {
2163  write: {
2164    names: {
2165      className: 'class',
2166      htmlFor:   'for'
2167    },
2168    values: { }
2169  }
2170};
2171
2172if (Prototype.Browser.Opera) {
2173  Element.Methods.getStyle = Element.Methods.getStyle.wrap(
2174    function(proceed, element, style) {
2175      switch (style) {
2176        case 'left': case 'top': case 'right': case 'bottom':
2177          if (proceed(element, 'position') === 'static') return null;
2178        case 'height': case 'width':
2179          // returns '0px' for hidden elements; we want it to return null
2180          if (!Element.visible(element)) return null;
2181
2182          // returns the border-box dimensions rather than the content-box
2183          // dimensions, so we subtract padding and borders from the value
2184          var dim = parseInt(proceed(element, style), 10);
2185
2186          if (dim !== element['offset' + style.capitalize()])
2187            return dim + 'px';
2188
2189          var properties;
2190          if (style === 'height') {
2191            properties = ['border-top-width', 'padding-top',
2192             'padding-bottom', 'border-bottom-width'];
2193          }
2194          else {
2195            properties = ['border-left-width', 'padding-left',
2196             'padding-right', 'border-right-width'];
2197          }
2198          return properties.inject(dim, function(memo, property) {
2199            var val = proceed(element, property);
2200            return val === null ? memo : memo - parseInt(val, 10);
2201          }) + 'px';
2202        default: return proceed(element, style);
2203      }
2204    }
2205  );
2206
2207  Element.Methods.readAttribute = Element.Methods.readAttribute.wrap(
2208    function(proceed, element, attribute) {
2209      if (attribute === 'title') return element.title;
2210      return proceed(element, attribute);
2211    }
2212  );
2213}
2214
2215else if (Prototype.Browser.IE) {
2216  // IE doesn't report offsets correctly for static elements, so we change them
2217  // to "relative" to get the values, then change them back.
2218  Element.Methods.getOffsetParent = Element.Methods.getOffsetParent.wrap(
2219    function(proceed, element) {
2220      element = $(element);
2221      var position = element.getStyle('position');
2222      if (position !== 'static') return proceed(element);
2223      element.setStyle({ position: 'relative' });
2224      var value = proceed(element);
2225      element.setStyle({ position: position });
2226      return value;
2227    }
2228  );
2229
2230  $w('positionedOffset viewportOffset').each(function(method) {
2231    Element.Methods[method] = Element.Methods[method].wrap(
2232      function(proceed, element) {
2233        element = $(element);
2234        var position = element.getStyle('position');
2235        if (position !== 'static') return proceed(element);
2236        // Trigger hasLayout on the offset parent so that IE6 reports
2237        // accurate offsetTop and offsetLeft values for position: fixed.
2238        var offsetParent = element.getOffsetParent();
2239        if (offsetParent && offsetParent.getStyle('position') === 'fixed')
2240          offsetParent.setStyle({ zoom: 1 });
2241        element.setStyle({ position: 'relative' });
2242        var value = proceed(element);
2243        element.setStyle({ position: position });
2244        return value;
2245      }
2246    );
2247  });
2248
2249  Element.Methods.getStyle = function(element, style) {
2250    element = $(element);
2251    style = (style == 'float' || style == 'cssFloat') ? 'styleFloat' : style.camelize();
2252    var value = element.style[style];
2253    if (!value && element.currentStyle) value = element.currentStyle[style];
2254
2255    if (style == 'opacity') {
2256      if (value = (element.getStyle('filter') || '').match(/alpha\(opacity=(.*)\)/))
2257        if (value[1]) return parseFloat(value[1]) / 100;
2258      return 1.0;
2259    }
2260
2261    if (value == 'auto') {
2262      if ((style == 'width' || style == 'height') && (element.getStyle('display') != 'none'))
2263        return element['offset' + style.capitalize()] + 'px';
2264      return null;
2265    }
2266    return value;
2267  };
2268
2269  Element.Methods.setOpacity = function(element, value) {
2270    function stripAlpha(filter){
2271      return filter.replace(/alpha\([^\)]*\)/gi,'');
2272    }
2273    element = $(element);
2274    var currentStyle = element.currentStyle;
2275    if ((currentStyle && !currentStyle.hasLayout) ||
2276      (!currentStyle && element.style.zoom == 'normal'))
2277        element.style.zoom = 1;
2278
2279    var filter = element.getStyle('filter'), style = element.style;
2280    if (value == 1 || value === '') {
2281      (filter = stripAlpha(filter)) ?
2282        style.filter = filter : style.removeAttribute('filter');
2283      return element;
2284    } else if (value < 0.00001) value = 0;
2285    style.filter = stripAlpha(filter) +
2286      'alpha(opacity=' + (value * 100) + ')';
2287    return element;
2288  };
2289
2290  Element._attributeTranslations = {
2291    read: {
2292      names: {
2293        'class': 'className',
2294        'for':   'htmlFor'
2295      },
2296      values: {
2297        _getAttr: function(element, attribute) {
2298          return element.getAttribute(attribute, 2);
2299        },
2300        _getAttrNode: function(element, attribute) {
2301          var node = element.getAttributeNode(attribute);
2302          return node ? node.value : "";
2303        },
2304        _getEv: function(element, attribute) {
2305          attribute = element.getAttribute(attribute);
2306          return attribute ? attribute.toString().slice(23, -2) : null;
2307        },
2308        _flag: function(element, attribute) {
2309          return $(element).hasAttribute(attribute) ? attribute : null;
2310        },
2311        style: function(element) {
2312          return element.style.cssText.toLowerCase();
2313        },
2314        title: function(element) {
2315          return element.title;
2316        }
2317      }
2318    }
2319  };
2320
2321  Element._attributeTranslations.write = {
2322    names: Object.extend({
2323      cellpadding: 'cellPadding',
2324      cellspacing: 'cellSpacing'
2325    }, Element._attributeTranslations.read.names),
2326    values: {
2327      checked: function(element, value) {
2328        element.checked = !!value;
2329      },
2330
2331      style: function(element, value) {
2332        element.style.cssText = value ? value : '';
2333      }
2334    }
2335  };
2336
2337  Element._attributeTranslations.has = {};
2338
2339  $w('colSpan rowSpan vAlign dateTime accessKey tabIndex ' +
2340      'encType maxLength readOnly longDesc').each(function(attr) {
2341    Element._attributeTranslations.write.names[attr.toLowerCase()] = attr;
2342    Element._attributeTranslations.has[attr.toLowerCase()] = attr;
2343  });
2344
2345  (function(v) {
2346    Object.extend(v, {
2347      href:        v._getAttr,
2348      src:         v._getAttr,
2349      type:        v._getAttr,
2350      action:      v._getAttrNode,
2351      disabled:    v._flag,
2352      checked:     v._flag,
2353      readonly:    v._flag,
2354      multiple:    v._flag,
2355      onload:      v._getEv,
2356      onunload:    v._getEv,
2357      onclick:     v._getEv,
2358      ondblclick:  v._getEv,
2359      onmousedown: v._getEv,
2360      onmouseup:   v._getEv,
2361      onmouseover: v._getEv,
2362      onmousemove: v._getEv,
2363      onmouseout:  v._getEv,
2364      onfocus:     v._getEv,
2365      onblur:      v._getEv,
2366      onkeypress:  v._getEv,
2367      onkeydown:   v._getEv,
2368      onkeyup:     v._getEv,
2369      onsubmit:    v._getEv,
2370      onreset:     v._getEv,
2371      onselect:    v._getEv,
2372      onchange:    v._getEv
2373    });
2374  })(Element._attributeTranslations.read.values);
2375}
2376
2377else if (Prototype.Browser.Gecko && /rv:1\.8\.0/.test(navigator.userAgent)) {
2378  Element.Methods.setOpacity = function(element, value) {
2379    element = $(element);
2380    element.style.opacity = (value == 1) ? 0.999999 :
2381      (value === '') ? '' : (value < 0.00001) ? 0 : value;
2382    return element;
2383  };
2384}
2385
2386else if (Prototype.Browser.WebKit) {
2387  Element.Methods.setOpacity = function(element, value) {
2388    element = $(element);
2389    element.style.opacity = (value == 1 || value === '') ? '' :
2390      (value < 0.00001) ? 0 : value;
2391
2392    if (value == 1)
2393      if(element.tagName == 'IMG' && element.width) {
2394        element.width++; element.width--;
2395      } else try {
2396        var n = document.createTextNode(' ');
2397        element.appendChild(n);
2398        element.removeChild(n);
2399      } catch (e) { }
2400
2401    return element;
2402  };
2403
2404  // Safari returns margins on body which is incorrect if the child is absolutely
2405  // positioned.  For performance reasons, redefine Element#cumulativeOffset for
2406  // KHTML/WebKit only.
2407  Element.Methods.cumulativeOffset = function(element) {
2408    var valueT = 0, valueL = 0;
2409    do {
2410      valueT += element.offsetTop  || 0;
2411      valueL += element.offsetLeft || 0;
2412      if (element.offsetParent == document.body)
2413        if (Element.getStyle(element, 'position') == 'absolute') break;
2414
2415      element = element.offsetParent;
2416    } while (element);
2417
2418    return Element._returnOffset(valueL, valueT);
2419  };
2420}
2421
2422if (Prototype.Browser.IE || Prototype.Browser.Opera) {
2423  // IE and Opera are missing .innerHTML support for TABLE-related and SELECT elements
2424  Element.Methods.update = function(element, content) {
2425    element = $(element);
2426
2427    if (content && content.toElement) content = content.toElement();
2428    if (Object.isElement(content)) return element.update().insert(content);
2429
2430    content = Object.toHTML(content);
2431    var tagName = element.tagName.toUpperCase();
2432
2433    if (tagName in Element._insertionTranslations.tags) {
2434      $A(element.childNodes).each(function(node) { element.removeChild(node) });
2435      Element._getContentFromAnonymousElement(tagName, content.stripScripts())
2436        .each(function(node) { element.appendChild(node) });
2437    }
2438    else element.innerHTML = content.stripScripts();
2439
2440    content.evalScripts.bind(content).defer();
2441    return element;
2442  };
2443}
2444
2445if ('outerHTML' in document.createElement('div')) {
2446  Element.Methods.replace = function(element, content) {
2447    element = $(element);
2448
2449    if (content && content.toElement) content = content.toElement();
2450    if (Object.isElement(content)) {
2451      element.parentNode.replaceChild(content, element);
2452      return element;
2453    }
2454
2455    content = Object.toHTML(content);
2456    var parent = element.parentNode, tagName = parent.tagName.toUpperCase();
2457
2458    if (Element._insertionTranslations.tags[tagName]) {
2459      var nextSibling = element.next();
2460      var fragments = Element._getContentFromAnonymousElement(tagName, content.stripScripts());
2461      parent.removeChild(element);
2462      if (nextSibling)
2463        fragments.each(function(node) { parent.insertBefore(node, nextSibling) });
2464      else
2465        fragments.each(function(node) { parent.appendChild(node) });
2466    }
2467    else element.outerHTML = content.stripScripts();
2468
2469    content.evalScripts.bind(content).defer();
2470    return element;
2471  };
2472}
2473
2474Element._returnOffset = function(l, t) {
2475  var result = [l, t];
2476  result.left = l;
2477  result.top = t;
2478  return result;
2479};
2480
2481Element._getContentFromAnonymousElement = function(tagName, html) {
2482  var div = new Element('div'), t = Element._insertionTranslations.tags[tagName];
2483  if (t) {
2484    div.innerHTML = t[0] + html + t[1];
2485    t[2].times(function() { div = div.firstChild });
2486  } else div.innerHTML = html;
2487  return $A(div.childNodes);
2488};
2489
2490Element._insertionTranslations = {
2491  before: function(element, node) {
2492    element.parentNode.insertBefore(node, element);
2493  },
2494  top: function(element, node) {
2495    element.insertBefore(node, element.firstChild);
2496  },
2497  bottom: function(element, node) {
2498    element.appendChild(node);
2499  },
2500  after: function(element, node) {
2501    element.parentNode.insertBefore(node, element.nextSibling);
2502  },
2503  tags: {
2504    TABLE:  ['<table>',                '</table>',                   1],
2505    TBODY:  ['<table><tbody>',         '</tbody></table>',           2],
2506    TR:     ['<table><tbody><tr>',     '</tr></tbody></table>',      3],
2507    TD:     ['<table><tbody><tr><td>', '</td></tr></tbody></table>', 4],
2508    SELECT: ['<select>',               '</select>',                  1]
2509  }
2510};
2511
2512(function() {
2513  Object.extend(this.tags, {
2514    THEAD: this.tags.TBODY,
2515    TFOOT: this.tags.TBODY,
2516    TH:    this.tags.TD
2517  });
2518}).call(Element._insertionTranslations);
2519
2520Element.Methods.Simulated = {
2521  hasAttribute: function(element, attribute) {
2522    attribute = Element._attributeTranslations.has[attribute] || attribute;
2523    var node = $(element).getAttributeNode(attribute);
2524    return node && node.specified;
2525  }
2526};
2527
2528Element.Methods.ByTag = { };
2529
2530Object.extend(Element, Element.Methods);
2531
2532if (!Prototype.BrowserFeatures.ElementExtensions &&
2533    document.createElement('div').__proto__) {
2534  window.HTMLElement = { };
2535  window.HTMLElement.prototype = document.createElement('div').__proto__;
2536  Prototype.BrowserFeatures.ElementExtensions = true;
2537}
2538
2539Element.extend = (function() {
2540  if (Prototype.BrowserFeatures.SpecificElementExtensions)
2541    return Prototype.K;
2542
2543  var Methods = { }, ByTag = Element.Methods.ByTag;
2544
2545  var extend = Object.extend(function(element) {
2546    if (!element || element._extendedByPrototype ||
2547        element.nodeType != 1 || element == window) return element;
2548
2549    var methods = Object.clone(Methods),
2550      tagName = element.tagName, property, value;
2551
2552    // extend methods for specific tags
2553    if (ByTag[tagName]) Object.extend(methods, ByTag[tagName]);
2554
2555    for (property in methods) {
2556      value = methods[property];
2557      if (Object.isFunction(value) && !(property in element))
2558        element[property] = value.methodize();
2559    }
2560
2561    element._extendedByPrototype = Prototype.emptyFunction;
2562    return element;
2563
2564  }, {
2565    refresh: function() {
2566      // extend methods for all tags (Safari doesn't need this)
2567      if (!Prototype.BrowserFeatures.ElementExtensions) {
2568        Object.extend(Methods, Element.Methods);
2569        Object.extend(Methods, Element.Methods.Simulated);
2570      }
2571    }
2572  });
2573
2574  extend.refresh();
2575  return extend;
2576})();
2577
2578Element.hasAttribute = function(element, attribute) {
2579  if (element.hasAttribute) return element.hasAttribute(attribute);
2580  return Element.Methods.Simulated.hasAttribute(element, attribute);
2581};
2582
2583Element.addMethods = function(methods) {
2584  var F = Prototype.BrowserFeatures, T = Element.Methods.ByTag;
2585
2586  if (!methods) {
2587    Object.extend(Form, Form.Methods);
2588    Object.extend(Form.Element, Form.Element.Methods);
2589    Object.extend(Element.Methods.ByTag, {
2590      "FORM":     Object.clone(Form.Methods),
2591      "INPUT":    Object.clone(Form.Element.Methods),
2592      "SELECT":   Object.clone(Form.Element.Methods),
2593      "TEXTAREA": Object.clone(Form.Element.Methods)
2594    });
2595  }
2596
2597  if (arguments.length == 2) {
2598    var tagName = methods;
2599    methods = arguments[1];
2600  }
2601
2602  if (!tagName) Object.extend(Element.Methods, methods || { });
2603  else {
2604    if (Object.isArray(tagName)) tagName.each(extend);
2605    else extend(tagName);
2606  }
2607
2608  function extend(tagName) {
2609    tagName = tagName.toUpperCase();
2610    if (!Element.Methods.ByTag[tagName])
2611      Element.Methods.ByTag[tagName] = { };
2612    Object.extend(Element.Methods.ByTag[tagName], methods);
2613  }
2614
2615  function copy(methods, destination, onlyIfAbsent) {
2616    onlyIfAbsent = onlyIfAbsent || false;
2617    for (var property in methods) {
2618      var value = methods[property];
2619      if (!Object.isFunction(value)) continue;
2620      if (!onlyIfAbsent || !(property in destination))
2621        destination[property] = value.methodize();
2622    }
2623  }
2624
2625  function findDOMClass(tagName) {
2626    var klass;
2627    var trans = {
2628      "OPTGROUP": "OptGroup", "TEXTAREA": "TextArea", "P": "Paragraph",
2629      "FIELDSET": "FieldSet", "UL": "UList", "OL": "OList", "DL": "DList",
2630      "DIR": "Directory", "H1": "Heading", "H2": "Heading", "H3": "Heading",
2631      "H4": "Heading", "H5": "Heading", "H6": "Heading", "Q": "Quote",
2632      "INS": "Mod", "DEL": "Mod", "A": "Anchor", "IMG": "Image", "CAPTION":
2633      "TableCaption", "COL": "TableCol", "COLGROUP": "TableCol", "THEAD":
2634      "TableSection", "TFOOT": "TableSection", "TBODY": "TableSection", "TR":
2635      "TableRow", "TH": "TableCell", "TD": "TableCell", "FRAMESET":
2636      "FrameSet", "IFRAME": "IFrame"
2637    };
2638    if (trans[tagName]) klass = 'HTML' + trans[tagName] + 'Element';
2639    if (window[klass]) return window[klass];
2640    klass = 'HTML' + tagName + 'Element';
2641    if (window[klass]) return window[klass];
2642    klass = 'HTML' + tagName.capitalize() + 'Element';
2643    if (window[klass]) return window[klass];
2644
2645    window[klass] = { };
2646    window[klass].prototype = document.createElement(tagName).__proto__;
2647    return window[klass];
2648  }
2649
2650  if (F.ElementExtensions) {
2651    copy(Element.Methods, HTMLElement.prototype);
2652    copy(Element.Methods.Simulated, HTMLElement.prototype, true);
2653  }
2654
2655  if (F.SpecificElementExtensions) {
2656    for (var tag in Element.Methods.ByTag) {
2657      var klass = findDOMClass(tag);
2658      if (Object.isUndefined(klass)) continue;
2659      copy(T[tag], klass.prototype);
2660    }
2661  }
2662
2663  Object.extend(Element, Element.Methods);
2664  delete Element.ByTag;
2665
2666  if (Element.extend.refresh) Element.extend.refresh();
2667  Element.cache = { };
2668};
2669
2670document.viewport = {
2671  getDimensions: function() {
2672    var dimensions = { };
2673    var B = Prototype.Browser;
2674    $w('width height').each(function(d) {
2675      var D = d.capitalize();
2676      dimensions[d] = (B.WebKit && !document.evaluate) ? self['inner' + D] :
2677        (B.Opera) ? document.body['client' + D] : document.documentElement['client' + D];
2678    });
2679    return dimensions;
2680  },
2681
2682  getWidth: function() {
2683    return this.getDimensions().width;
2684  },
2685
2686  getHeight: function() {
2687    return this.getDimensions().height;
2688  },
2689
2690  getScrollOffsets: function() {
2691    return Element._returnOffset(
2692      window.pageXOffset || document.documentElement.scrollLeft || document.body.scrollLeft,
2693      window.pageYOffset || document.documentElement.scrollTop || document.body.scrollTop);
2694  }
2695};
2696/* Portions of the Selector class are derived from Jack Slocum’s DomQuery,
2697 * part of YUI-Ext version 0.40, distributed under the terms of an MIT-style
2698 * license.  Please see http://www.yui-ext.com/ for more information. */
2699
2700var Selector = Class.create({
2701  initialize: function(expression) {
2702    this.expression = expression.strip();
2703    this.compileMatcher();
2704  },
2705
2706  shouldUseXPath: function() {
2707    if (!Prototype.BrowserFeatures.XPath) return false;
2708
2709    var e = this.expression;
2710
2711    // Safari 3 chokes on :*-of-type and :empty
2712    if (Prototype.Browser.WebKit &&
2713     (e.include("-of-type") || e.include(":empty")))
2714      return false;
2715
2716    // XPath can't do namespaced attributes, nor can it read
2717    // the "checked" property from DOM nodes
2718    if ((/(\[[\w-]*?:|:checked)/).test(this.expression))
2719      return false;
2720
2721    return true;
2722  },
2723
2724  compileMatcher: function() {
2725    if (this.shouldUseXPath())
2726      return this.compileXPathMatcher();
2727
2728    var e = this.expression, ps = Selector.patterns, h = Selector.handlers,
2729        c = Selector.criteria, le, p, m;
2730
2731    if (Selector._cache[e]) {
2732      this.matcher = Selector._cache[e];
2733      return;
2734    }
2735
2736    this.matcher = ["this.matcher = function(root) {",
2737                    "var r = root, h = Selector.handlers, c = false, n;"];
2738
2739    while (e && le != e && (/\S/).test(e)) {
2740      le = e;
2741      for (var i in ps) {
2742        p = ps[i];
2743        if (m = e.match(p)) {
2744          this.matcher.push(Object.isFunction(c[i]) ? c[i](m) :
2745    	      new Template(c[i]).evaluate(m));
2746          e = e.replace(m[0], '');
2747          break;
2748        }
2749      }
2750    }
2751
2752    this.matcher.push("return h.unique(n);\n}");
2753    eval(this.matcher.join('\n'));
2754    Selector._cache[this.expression] = this.matcher;
2755  },
2756
2757  compileXPathMatcher: function() {
2758    var e = this.expression, ps = Selector.patterns,
2759        x = Selector.xpath, le, m;
2760
2761    if (Selector._cache[e]) {
2762      this.xpath = Selector._cache[e]; return;
2763    }
2764
2765    this.matcher = ['.//*'];
2766    while (e && le != e && (/\S/).test(e)) {
2767      le = e;
2768      for (var i in ps) {
2769        if (m = e.match(ps[i])) {
2770          this.matcher.push(Object.isFunction(x[i]) ? x[i](m) :
2771            new Template(x[i]).evaluate(m));
2772          e = e.replace(m[0], '');
2773          break;
2774        }
2775      }
2776    }
2777
2778    this.xpath = this.matcher.join('');
2779    Selector._cache[this.expression] = this.xpath;
2780  },
2781
2782  findElements: function(root) {
2783    root = root || document;
2784    if (this.xpath) return document._getElementsByXPath(this.xpath, root);
2785    return this.matcher(root);
2786  },
2787
2788  match: function(element) {
2789    this.tokens = [];
2790
2791    var e = this.expression, ps = Selector.patterns, as = Selector.assertions;
2792    var le, p, m;
2793
2794    while (e && le !== e && (/\S/).test(e)) {
2795      le = e;
2796      for (var i in ps) {
2797        p = ps[i];
2798        if (m = e.match(p)) {
2799          // use the Selector.assertions methods unless the selector
2800          // is too complex.
2801          if (as[i]) {
2802            this.tokens.push([i, Object.clone(m)]);
2803            e = e.replace(m[0], '');
2804          } else {
2805            // reluctantly do a document-wide search
2806            // and look for a match in the array
2807            return this.findElements(document).include(element);
2808          }
2809        }
2810      }
2811    }
2812
2813    var match = true, name, matches;
2814    for (var i = 0, token; token = this.tokens[i]; i++) {
2815      name = token[0], matches = token[1];
2816      if (!Selector.assertions[name](element, matches)) {
2817        match = false; break;
2818      }
2819    }
2820
2821    return match;
2822  },
2823
2824  toString: function() {
2825    return this.expression;
2826  },
2827
2828  inspect: function() {
2829    return "#<Selector:" + this.expression.inspect() + ">";
2830  }
2831});
2832
2833Object.extend(Selector, {
2834  _cache: { },
2835
2836  xpath: {
2837    descendant:   "//*",
2838    child:        "/*",
2839    adjacent:     "/following-sibling::*[1]",
2840    laterSibling: '/following-sibling::*',
2841    tagName:      function(m) {
2842      if (m[1] == '*') return '';
2843      return "[local-name()='" + m[1].toLowerCase() +
2844             "' or local-name()='" + m[1].toUpperCase() + "']";
2845    },
2846    className:    "[contains(concat(' ', @class, ' '), ' #{1} ')]",
2847    id:           "[@id='#{1}']",
2848    attrPresence: function(m) {
2849      m[1] = m[1].toLowerCase();
2850      return new Template("[@#{1}]").evaluate(m);
2851    },
2852    attr: function(m) {
2853      m[1] = m[1].toLowerCase();
2854      m[3] = m[5] || m[6];
2855      return new Template(Selector.xpath.operators[m[2]]).evaluate(m);
2856    },
2857    pseudo: function(m) {
2858      var h = Selector.xpath.pseudos[m[1]];
2859      if (!h) return '';
2860      if (Object.isFunction(h)) return h(m);
2861      return new Template(Selector.xpath.pseudos[m[1]]).evaluate(m);
2862    },
2863    operators: {
2864      '=':  "[@#{1}='#{3}']",
2865      '!=': "[@#{1}!='#{3}']",
2866      '^=': "[starts-with(@#{1}, '#{3}')]",
2867      '$=': "[substring(@#{1}, (string-length(@#{1}) - string-length('#{3}') + 1))='#{3}']",
2868      '*=': "[contains(@#{1}, '#{3}')]",
2869      '~=': "[contains(concat(' ', @#{1}, ' '), ' #{3} ')]",
2870      '|=': "[contains(concat('-', @#{1}, '-'), '-#{3}-')]"
2871    },
2872    pseudos: {
2873      'first-child': '[not(preceding-sibling::*)]',
2874      'last-child':  '[not(following-sibling::*)]',
2875      'only-child':  '[not(preceding-sibling::* or following-sibling::*)]',
2876      'empty':       "[count(*) = 0 and (count(text()) = 0 or translate(text(), ' \t\r\n', '') = '')]",
2877      'checked':     "[@checked]",
2878      'disabled':    "[@disabled]",
2879      'enabled':     "[not(@disabled)]",
2880      'not': function(m) {
2881        var e = m[6], p = Selector.patterns,
2882            x = Selector.xpath, le, v;
2883
2884        var exclusion = [];
2885        while (e && le != e && (/\S/).test(e)) {
2886          le = e;
2887          for (var i in p) {
2888            if (m = e.match(p[i])) {
2889              v = Object.isFunction(x[i]) ? x[i](m) : new Template(x[i]).evaluate(m);
2890              exclusion.push("(" + v.substring(1, v.length - 1) + ")");
2891              e = e.replace(m[0], '');
2892              break;
2893            }
2894          }
2895        }
2896        return "[not(" + exclusion.join(" and ") + ")]";
2897      },
2898      'nth-child':      function(m) {
2899        return Selector.xpath.pseudos.nth("(count(./preceding-sibling::*) + 1) ", m);
2900      },
2901      'nth-last-child': function(m) {
2902        return Selector.xpath.pseudos.nth("(count(./following-sibling::*) + 1) ", m);
2903      },
2904      'nth-of-type':    function(m) {
2905        return Selector.xpath.pseudos.nth("position() ", m);
2906      },
2907      'nth-last-of-type': function(m) {
2908        return Selector.xpath.pseudos.nth("(last() + 1 - position()) ", m);
2909      },
2910      'first-of-type':  function(m) {
2911        m[6] = "1"; return Selector.xpath.pseudos['nth-of-type'](m);
2912      },
2913      'last-of-type':   function(m) {
2914        m[6] = "1"; return Selector.xpath.pseudos['nth-last-of-type'](m);
2915      },
2916      'only-of-type':   function(m) {
2917        var p = Selector.xpath.pseudos; return p['first-of-type'](m) + p['last-of-type'](m);
2918      },
2919      nth: function(fragment, m) {
2920        var mm, formula = m[6], predicate;
2921        if (formula == 'even') formula = '2n+0';
2922        if (formula == 'odd')  formula = '2n+1';
2923        if (mm = formula.match(/^(\d+)$/)) // digit only
2924          return '[' + fragment + "= " + mm[1] + ']';
2925        if (mm = formula.match(/^(-?\d*)?n(([+-])(\d+))?/)) { // an+b
2926          if (mm[1] == "-") mm[1] = -1;
2927          var a = mm[1] ? Number(mm[1]) : 1;
2928          var b = mm[2] ? Number(mm[2]) : 0;
2929          predicate = "[((#{fragment} - #{b}) mod #{a} = 0) and " +
2930          "((#{fragment} - #{b}) div #{a} >= 0)]";
2931          return new Template(predicate).evaluate({
2932            fragment: fragment, a: a, b: b });
2933        }
2934      }
2935    }
2936  },
2937
2938  criteria: {
2939    tagName:      'n = h.tagName(n, r, "#{1}", c);      c = false;',
2940    className:    'n = h.className(n, r, "#{1}", c);    c = false;',
2941    id:           'n = h.id(n, r, "#{1}", c);           c = false;',
2942    attrPresence: 'n = h.attrPresence(n, r, "#{1}", c); c = false;',
2943    attr: function(m) {
2944      m[3] = (m[5] || m[6]);
2945      return new Template('n = h.attr(n, r, "#{1}", "#{3}", "#{2}", c); c = false;').evaluate(m);
2946    },
2947    pseudo: function(m) {
2948      if (m[6]) m[6] = m[6].replace(/"/g, '\\"');
2949      return new Template('n = h.pseudo(n, "#{1}", "#{6}", r, c); c = false;').evaluate(m);
2950    },
2951    descendant:   'c = "descendant";',
2952    child:        'c = "child";',
2953    adjacent:     'c = "adjacent";',
2954    laterSibling: 'c = "laterSibling";'
2955  },
2956
2957  patterns: {
2958    // combinators must be listed first
2959    // (and descendant needs to be last combinator)
2960    laterSibling: /^\s*~\s*/,
2961    child:        /^\s*>\s*/,
2962    adjacent:     /^\s*\+\s*/,
2963    descendant:   /^\s/,
2964
2965    // selectors follow
2966    tagName:      /^\s*(\*|[\w\-]+)(\b|$)?/,
2967    id:           /^#([\w\-\*]+)(\b|$)/,
2968    className:    /^\.([\w\-\*]+)(\b|$)/,
2969    pseudo:
2970/^:((first|last|nth|nth-last|only)(-child|-of-type)|empty|checked|(en|dis)abled|not)(\((.*?)\))?(\b|$|(?=\s|[:+~>]))/,
2971    attrPresence: /^\[([\w]+)\]/,
2972    attr:         /\[((?:[\w-]*:)?[\w-]+)\s*(?:([!^$*~|]?=)\s*((['"])([^\4]*?)\4|([^'"][^\]]*?)))?\]/
2973  },
2974
2975  // for Selector.match and Element#match
2976  assertions: {
2977    tagName: function(element, matches) {
2978      return matches[1].toUpperCase() == element.tagName.toUpperCase();
2979    },
2980
2981    className: function(element, matches) {
2982      return Element.hasClassName(element, matches[1]);
2983    },
2984
2985    id: function(element, matches) {
2986      return element.id === matches[1];
2987    },
2988
2989    attrPresence: function(element, matches) {
2990      return Element.hasAttribute(element, matches[1]);
2991    },
2992
2993    attr: function(element, matches) {
2994      var nodeValue = Element.readAttribute(element, matches[1]);
2995      return nodeValue && Selector.operators[matches[2]](nodeValue, matches[5] || matches[6]);
2996    }
2997  },
2998
2999  handlers: {
3000    // UTILITY FUNCTIONS
3001    // joins two collections
3002    concat: function(a, b) {
3003      for (var i = 0, node; node = b[i]; i++)
3004        a.push(node);
3005      return a;
3006    },
3007
3008    // marks an array of nodes for counting
3009    mark: function(nodes) {
3010      var _true = Prototype.emptyFunction;
3011      for (var i = 0, node; node = nodes[i]; i++)
3012        node._countedByPrototype = _true;
3013      return nodes;
3014    },
3015
3016    unmark: function(nodes) {
3017      for (var i = 0, node; node = nodes[i]; i++)
3018        node._countedByPrototype = undefined;
3019      return nodes;
3020    },
3021
3022    // mark each child node with its position (for nth calls)
3023    // "ofType" flag indicates whether we're indexing for nth-of-type
3024    // rather than nth-child
3025    index: function(parentNode, reverse, ofType) {
3026      parentNode._countedByPrototype = Prototype.emptyFunction;
3027      if (reverse) {
3028        for (var nodes = parentNode.childNodes, i = nodes.length - 1, j = 1; i >= 0; i--) {
3029          var node = nodes[i];
3030          if (node.nodeType == 1 && (!ofType || node._countedByPrototype)) node.nodeIndex = j++;
3031        }
3032      } else {
3033        for (var i = 0, j = 1, nodes = parentNode.childNodes; node = nodes[i]; i++)
3034          if (node.nodeType == 1 && (!ofType || node._countedByPrototype)) node.nodeIndex = j++;
3035      }
3036    },
3037
3038    // filters out duplicates and extends all nodes
3039    unique: function(nodes) {
3040      if (nodes.length == 0) return nodes;
3041      var results = [], n;
3042      for (var i = 0, l = nodes.length; i < l; i++)
3043        if (!(n = nodes[i])._countedByPrototype) {
3044          n._countedByPrototype = Prototype.emptyFunction;
3045          results.push(Element.extend(n));
3046        }
3047      return Selector.handlers.unmark(results);
3048    },
3049
3050    // COMBINATOR FUNCTIONS
3051    descendant: function(nodes) {
3052      var h = Selector.handlers;
3053      for (var i = 0, results = [], node; node = nodes[i]; i++)
3054        h.concat(results, node.getElementsByTagName('*'));
3055      return results;
3056    },
3057
3058    child: function(nodes) {
3059      var h = Selector.handlers;
3060      for (var i = 0, results = [], node; node = nodes[i]; i++) {
3061        for (var j = 0, child; child = node.childNodes[j]; j++)
3062          if (child.nodeType == 1 && child.tagName != '!') results.push(child);
3063      }
3064      return results;
3065    },
3066
3067    adjacent: function(nodes) {
3068      for (var i = 0, results = [], node; node = nodes[i]; i++) {
3069        var next = this.nextElementSibling(node);
3070        if (next) results.push(next);
3071      }
3072      return results;
3073    },
3074
3075    laterSibling: function(nodes) {
3076      var h = Selector.handlers;
3077      for (var i = 0, results = [], node; node = nodes[i]; i++)
3078        h.concat(results, Element.nextSiblings(node));
3079      return results;
3080    },
3081
3082    nextElementSibling: function(node) {
3083      while (node = node.nextSibling)
3084	      if (node.nodeType == 1) return node;
3085      return null;
3086    },
3087
3088    previousElementSibling: function(node) {
3089      while (node = node.previousSibling)
3090        if (node.nodeType == 1) return node;
3091      return null;
3092    },
3093
3094    // TOKEN FUNCTIONS
3095    tagName: function(nodes, root, tagName, combinator) {
3096      var uTagName = tagName.toUpperCase();
3097      var results = [], h = Selector.handlers;
3098      if (nodes) {
3099        if (combinator) {
3100          // fastlane for ordinary descendant combinators
3101          if (combinator == "descendant") {
3102            for (var i = 0, node; node = nodes[i]; i++)
3103              h.concat(results, node.getElementsByTagName(tagName));
3104            return results;
3105          } else nodes = this[combinator](nodes);
3106          if (tagName == "*") return nodes;
3107        }
3108        for (var i = 0, node; node = nodes[i]; i++)
3109          if (node.tagName.toUpperCase() === uTagName) results.push(node);
3110        return results;
3111      } else return root.getElementsByTagName(tagName);
3112    },
3113
3114    id: function(nodes, root, id, combinator) {
3115      var targetNode = $(id), h = Selector.handlers;
3116      if (!targetNode) return [];
3117      if (!nodes && root == document) return [targetNode];
3118      if (nodes) {
3119        if (combinator) {
3120          if (combinator == 'child') {
3121            for (var i = 0, node; node = nodes[i]; i++)
3122              if (targetNode.parentNode == node) return [targetNode];
3123          } else if (combinator == 'descendant') {
3124            for (var i = 0, node; node = nodes[i]; i++)
3125              if (Element.descendantOf(targetNode, node)) return [targetNode];
3126          } else if (combinator == 'adjacent') {
3127            for (var i = 0, node; node = nodes[i]; i++)
3128              if (Selector.handlers.previousElementSibling(targetNode) == node)
3129                return [targetNode];
3130          } else nodes = h[combinator](nodes);
3131        }
3132        for (var i = 0, node; node = nodes[i]; i++)
3133          if (node == targetNode) return [targetNode];
3134        return [];
3135      }
3136      return (targetNode && Element.descendantOf(targetNode, root)) ? [targetNode] : [];
3137    },
3138
3139    className: function(nodes, root, className, combinator) {
3140      if (nodes && combinator) nodes = this[combinator](nodes);
3141      return Selector.handlers.byClassName(nodes, root, className);
3142    },
3143
3144    byClassName: function(nodes, root, className) {
3145      if (!nodes) nodes = Selector.handlers.descendant([root]);
3146      var needle = ' ' + className + ' ';
3147      for (var i = 0, results = [], node, nodeClassName; node = nodes[i]; i++) {
3148        nodeClassName = node.className;
3149        if (nodeClassName.length == 0) continue;
3150        if (nodeClassName == className || (' ' + nodeClassName + ' ').include(needle))
3151          results.push(node);
3152      }
3153      return results;
3154    },
3155
3156    attrPresence: function(nodes, root, attr, combinator) {
3157      if (!nodes) nodes = root.getElementsByTagName("*");
3158      if (nodes && combinator) nodes = this[combinator](nodes);
3159      var results = [];
3160      for (var i = 0, node; node = nodes[i]; i++)
3161        if (Element.hasAttribute(node, attr)) results.push(node);
3162      return results;
3163    },
3164
3165    attr: function(nodes, root, attr, value, operator, combinator) {
3166      if (!nodes) nodes = root.getElementsByTagName("*");
3167      if (nodes && combinator) nodes = this[combinator](nodes);
3168      var handler = Selector.operators[operator], results = [];
3169      for (var i = 0, node; node = nodes[i]; i++) {
3170        var nodeValue = Element.readAttribute(node, attr);
3171        if (nodeValue === null) continue;
3172        if (handler(nodeValue, value)) results.push(node);
3173      }
3174      return results;
3175    },
3176
3177    pseudo: function(nodes, name, value, root, combinator) {
3178      if (nodes && combinator) nodes = this[combinator](nodes);
3179      if (!nodes) nodes = root.getElementsByTagName("*");
3180      return Selector.pseudos[name](nodes, value, root);
3181    }
3182  },
3183
3184  pseudos: {
3185    'first-child': function(nodes, value, root) {
3186      for (var i = 0, results = [], node; node = nodes[i]; i++) {
3187        if (Selector.handlers.previousElementSibling(node)) continue;
3188          results.push(node);
3189      }
3190      return results;
3191    },
3192    'last-child': function(nodes, value, root) {
3193      for (var i = 0, results = [], node; node = nodes[i]; i++) {
3194        if (Selector.handlers.nextElementSibling(node)) continue;
3195          results.push(node);
3196      }
3197      return results;
3198    },
3199    'only-child': function(nodes, value, root) {
3200      var h = Selector.handlers;
3201      for (var i = 0, results = [], node; node = nodes[i]; i++)
3202        if (!h.previousElementSibling(node) && !h.nextElementSibling(node))
3203          results.push(node);
3204      return results;
3205    },
3206    'nth-child':        function(nodes, formula, root) {
3207      return Selector.pseudos.nth(nodes, formula, root);
3208    },
3209    'nth-last-child':   function(nodes, formula, root) {
3210      return Selector.pseudos.nth(nodes, formula, root, true);
3211    },
3212    'nth-of-type':      function(nodes, formula, root) {
3213      return Selector.pseudos.nth(nodes, formula, root, false, true);
3214    },
3215    'nth-last-of-type': function(nodes, formula, root) {
3216      return Selector.pseudos.nth(nodes, formula, root, true, true);
3217    },
3218    'first-of-type':    function(nodes, formula, root) {
3219      return Selector.pseudos.nth(nodes, "1", root, false, true);
3220    },
3221    'last-of-type':     function(nodes, formula, root) {
3222      return Selector.pseudos.nth(nodes, "1", root, true, true);
3223    },
3224    'only-of-type':     function(nodes, formula, root) {
3225      var p = Selector.pseudos;
3226      return p['last-of-type'](p['first-of-type'](nodes, formula, root), formula, root);
3227    },
3228
3229    // handles the an+b logic
3230    getIndices: function(a, b, total) {
3231      if (a == 0) return b > 0 ? [b] : [];
3232      return $R(1, total).inject([], function(memo, i) {
3233        if (0 == (i - b) % a && (i - b) / a >= 0) memo.push(i);
3234        return memo;
3235      });
3236    },
3237
3238    // handles nth(-last)-child, nth(-last)-of-type, and (first|last)-of-type
3239    nth: function(nodes, formula, root, reverse, ofType) {
3240      if (nodes.length == 0) return [];
3241      if (formula == 'even') formula = '2n+0';
3242      if (formula == 'odd')  formula = '2n+1';
3243      var h = Selector.handlers, results = [], indexed = [], m;
3244      h.mark(nodes);
3245      for (var i = 0, node; node = nodes[i]; i++) {
3246        if (!node.parentNode._countedByPrototype) {
3247          h.index(node.parentNode, reverse, ofType);
3248          indexed.push(node.parentNode);
3249        }
3250      }
3251      if (formula.match(/^\d+$/)) { // just a number
3252        formula = Number(formula);
3253        for (var i = 0, node; node = nodes[i]; i++)
3254          if (node.nodeIndex == formula) results.push(node);
3255      } else if (m = formula.match(/^(-?\d*)?n(([+-])(\d+))?/)) { // an+b
3256        if (m[1] == "-") m[1] = -1;
3257        var a = m[1] ? Number(m[1]) : 1;
3258        var b = m[2] ? Number(m[2]) : 0;
3259        var indices = Selector.pseudos.getIndices(a, b, nodes.length);
3260        for (var i = 0, node, l = indices.length; node = nodes[i]; i++) {
3261          for (var j = 0; j < l; j++)
3262            if (node.nodeIndex == indices[j]) results.push(node);
3263        }
3264      }
3265      h.unmark(nodes);
3266      h.unmark(indexed);
3267      return results;
3268    },
3269
3270    'empty': function(nodes, value, root) {
3271      for (var i = 0, results = [], node; node = nodes[i]; i++) {
3272        // IE treats comments as element nodes
3273        if (node.tagName == '!' || (node.firstChild && !node.innerHTML.match(/^\s*$/))) continue;
3274        results.push(node);
3275      }
3276      return results;
3277    },
3278
3279    'not': function(nodes, selector, root) {
3280      var h = Selector.handlers, selectorType, m;
3281      var exclusions = new Selector(selector).findElements(root);
3282      h.mark(exclusions);
3283      for (var i = 0, results = [], node; node = nodes[i]; i++)
3284        if (!node._countedByPrototype) results.push(node);
3285      h.unmark(exclusions);
3286      return results;
3287    },
3288
3289    'enabled': function(nodes, value, root) {
3290      for (var i = 0, results = [], node; node = nodes[i]; i++)
3291        if (!node.disabled) results.push(node);
3292      return results;
3293    },
3294
3295    'disabled': function(nodes, value, root) {
3296      for (var i = 0, results = [], node; node = nodes[i]; i++)
3297        if (node.disabled) results.push(node);
3298      return results;
3299    },
3300
3301    'checked': function(nodes, value, root) {
3302      for (var i = 0, results = [], node; node = nodes[i]; i++)
3303        if (node.checked) results.push(node);
3304      return results;
3305    }
3306  },
3307
3308  operators: {
3309    '=':  function(nv, v) { return nv == v; },
3310    '!=': function(nv, v) { return nv != v; },
3311    '^=': function(nv, v) { return nv.startsWith(v); },
3312    '$=': function(nv, v) { return nv.endsWith(v); },
3313    '*=': function(nv, v) { return nv.include(v); },
3314    '~=': function(nv, v) { return (' ' + nv + ' ').include(' ' + v + ' '); },
3315    '|=': function(nv, v) { return ('-' + nv.toUpperCase() + '-').include('-' + v.toUpperCase() + '-'); }
3316  },
3317
3318  split: function(expression) {
3319    var expressions = [];
3320    expression.scan(/(([\w#:.~>+()\s-]+|\*|\[.*?\])+)\s*(,|$)/, function(m) {
3321      expressions.push(m[1].strip());
3322    });
3323    return expressions;
3324  },
3325
3326  matchElements: function(elements, expression) {
3327    var matches = $$(expression), h = Selector.handlers;
3328    h.mark(matches);
3329    for (var i = 0, results = [], element; element = elements[i]; i++)
3330      if (element._countedByPrototype) results.push(element);
3331    h.unmark(matches);
3332    return results;
3333  },
3334
3335  findElement: function(elements, expression, index) {
3336    if (Object.isNumber(expression)) {
3337      index = expression; expression = false;
3338    }
3339    return Selector.matchElements(elements, expression || '*')[index || 0];
3340  },
3341
3342  findChildElements: function(element, expressions) {
3343    expressions = Selector.split(expressions.join(','));
3344    var results = [], h = Selector.handlers;
3345    for (var i = 0, l = expressions.length, selector; i < l; i++) {
3346      selector = new Selector(expressions[i].strip());
3347      h.concat(results, selector.findElements(element));
3348    }
3349    return (l > 1) ? h.unique(results) : results;
3350  }
3351});
3352
3353if (Prototype.Browser.IE) {
3354  Object.extend(Selector.handlers, {
3355    // IE returns comment nodes on getElementsByTagName("*").
3356    // Filter them out.
3357    concat: function(a, b) {
3358      for (var i = 0, node; node = b[i]; i++)
3359        if (node.tagName !== "!") a.push(node);
3360      return a;
3361    },
3362
3363    // IE improperly serializes _countedByPrototype in (inner|outer)HTML.
3364    unmark: function(nodes) {
3365      for (var i = 0, node; node = nodes[i]; i++)
3366        node.removeAttribute('_countedByPrototype');
3367      return nodes;
3368    }
3369  });
3370}
3371
3372function $$() {
3373  return Selector.findChildElements(document, $A(arguments));
3374}
3375var Form = {
3376  reset: function(form) {
3377    $(form).reset();
3378    return form;
3379  },
3380
3381  serializeElements: function(elements, options) {
3382    if (typeof options != 'object') options = { hash: !!options };
3383    else if (Object.isUndefined(options.hash)) options.hash = true;
3384    var key, value, submitted = false, submit = options.submit;
3385
3386    var data = elements.inject({ }, function(result, element) {
3387      if (!element.disabled && element.name) {
3388        key = element.name; value = $(element).getValue();
3389        if (value != null && (element.type != 'submit' || (!submitted &&
3390            submit !== false && (!submit || key == submit) && (submitted = true)))) {
3391          if (key in result) {
3392            // a key is already present; construct an array of values
3393            if (!Object.isArray(result[key])) result[key] = [result[key]];
3394            result[key].push(value);
3395          }
3396          else result[key] = value;
3397        }
3398      }
3399      return result;
3400    });
3401
3402    return options.hash ? data : Object.toQueryString(data);
3403  }
3404};
3405
3406Form.Methods = {
3407  serialize: function(form, options) {
3408    return Form.serializeElements(Form.getElements(form), options);
3409  },
3410
3411  getElements: function(form) {
3412    return $A($(form).getElementsByTagName('*')).inject([],
3413      function(elements, child) {
3414        if (Form.Element.Serializers[child.tagName.toLowerCase()])
3415          elements.push(Element.extend(child));
3416        return elements;
3417      }
3418    );
3419  },
3420
3421  getInputs: function(form, typeName, name) {
3422    form = $(form);
3423    var inputs = form.getElementsByTagName('input');
3424
3425    if (!typeName && !name) return $A(inputs).map(Element.extend);
3426
3427    for (var i = 0, matchingInputs = [], length = inputs.length; i < length; i++) {
3428      var input = inputs[i];
3429      if ((typeName && input.type != typeName) || (name && input.name != name))
3430        continue;
3431      matchingInputs.push(Element.extend(input));
3432    }
3433
3434    return matchingInputs;
3435  },
3436
3437  disable: function(form) {
3438    form = $(form);
3439    Form.getElements(form).invoke('disable');
3440    return form;
3441  },
3442
3443  enable: function(form) {
3444    form = $(form);
3445    Form.getElements(form).invoke('enable');
3446    return form;
3447  },
3448
3449  findFirstElement: function(form) {
3450    var elements = $(form).getElements().findAll(function(element) {
3451      return 'hidden' != element.type && !element.disabled;
3452    });
3453    var firstByIndex = elements.findAll(function(element) {
3454      return element.hasAttribute('tabIndex') && element.tabIndex >= 0;
3455    }).sortBy(function(element) { return element.tabIndex }).first();
3456
3457    return firstByIndex ? firstByIndex : elements.find(function(element) {
3458      return ['input', 'select', 'textarea'].include(element.tagName.toLowerCase());
3459    });
3460  },
3461
3462  focusFirstElement: function(form) {
3463    form = $(form);
3464    form.findFirstElement().activate();
3465    return form;
3466  },
3467
3468  request: function(form, options) {
3469    form = $(form), options = Object.clone(options || { });
3470
3471    var params = options.parameters, action = form.readAttribute('action') || '';
3472    if (action.blank()) action = window.location.href;
3473    options.parameters = form.serialize(true);
3474
3475    if (params) {
3476      if (Object.isString(params)) params = params.toQueryParams();
3477      Object.extend(options.parameters, params);
3478    }
3479
3480    if (form.hasAttribute('method') && !options.method)
3481      options.method = form.method;
3482
3483    return new Ajax.Request(action, options);
3484  }
3485};
3486
3487/*--------------------------------------------------------------------------*/
3488
3489Form.Element = {
3490  focus: function(element) {
3491    $(element).focus();
3492    return element;
3493  },
3494
3495  select: function(element) {
3496    $(element).select();
3497    return element;
3498  }
3499};
3500
3501Form.Element.Methods = {
3502  serialize: function(element) {
3503    element = $(element);
3504    if (!element.disabled && element.name) {
3505      var value = element.getValue();
3506      if (value != undefined) {
3507        var pair = { };
3508        pair[element.name] = value;
3509        return Object.toQueryString(pair);
3510      }
3511    }
3512    return '';
3513  },
3514
3515  getValue: function(element) {
3516    element = $(element);
3517    var method = element.tagName.toLowerCase();
3518    return Form.Element.Serializers[method](element);
3519  },
3520
3521  setValue: function(element, value) {
3522    element = $(element);
3523    var method = element.tagName.toLowerCase();
3524    Form.Element.Serializers[method](element, value);
3525    return element;
3526  },
3527
3528  clear: function(element) {
3529    $(element).value = '';
3530    return element;
3531  },
3532
3533  present: function(element) {
3534    return $(element).value != '';
3535  },
3536
3537  activate: function(element) {
3538    element = $(element);
3539    try {
3540      element.focus();
3541      if (element.select && (element.tagName.toLowerCase() != 'input' ||
3542          !['button', 'reset', 'submit'].include(element.type)))
3543        element.select();
3544    } catch (e) { }
3545    return element;
3546  },
3547
3548  disable: function(element) {
3549    element = $(element);
3550    element.blur();
3551    element.disabled = true;
3552    return element;
3553  },
3554
3555  enable: function(element) {
3556    element = $(element);
3557    element.disabled = false;
3558    return element;
3559  }
3560};
3561
3562/*--------------------------------------------------------------------------*/
3563
3564var Field = Form.Element;
3565var $F = Form.Element.Methods.getValue;
3566
3567/*--------------------------------------------------------------------------*/
3568
3569Form.Element.Serializers = {
3570  input: function(element, value) {
3571    switch (element.type.toLowerCase()) {
3572      case 'checkbox':
3573      case 'radio':
3574        return Form.Element.Serializers.inputSelector(element, value);
3575      default:
3576        return Form.Element.Serializers.textarea(element, value);
3577    }
3578  },
3579
3580  inputSelector: function(element, value) {
3581    if (Object.isUndefined(value)) return element.checked ? element.value : null;
3582    else element.checked = !!value;
3583  },
3584
3585  textarea: function(element, value) {
3586    if (Object.isUndefined(value)) return element.value;
3587    else element.value = value;
3588  },
3589
3590  select: function(element, index) {
3591    if (Object.isUndefined(index))
3592      return this[element.type == 'select-one' ?
3593        'selectOne' : 'selectMany'](element);
3594    else {
3595      var opt, value, single = !Object.isArray(index);
3596      for (var i = 0, length = element.length; i < length; i++) {
3597        opt = element.options[i];
3598        value = this.optionValue(opt);
3599        if (single) {
3600          if (value == index) {
3601            opt.selected = true;
3602            return;
3603          }
3604        }
3605        else opt.selected = index.include(value);
3606      }
3607    }
3608  },
3609
3610  selectOne: function(element) {
3611    var index = element.selectedIndex;
3612    return index >= 0 ? this.optionValue(element.options[index]) : null;
3613  },
3614
3615  selectMany: function(element) {
3616    var values, length = element.length;
3617    if (!length) return null;
3618
3619    for (var i = 0, values = []; i < length; i++) {
3620      var opt = element.options[i];
3621      if (opt.selected) values.push(this.optionValue(opt));
3622    }
3623    return values;
3624  },
3625
3626  optionValue: function(opt) {
3627    // extend element because hasAttribute may not be native
3628    return Element.extend(opt).hasAttribute('value') ? opt.value : opt.text;
3629  }
3630};
3631
3632/*--------------------------------------------------------------------------*/
3633
3634Abstract.TimedObserver = Class.create(PeriodicalExecuter, {
3635  initialize: function($super, element, frequency, callback) {
3636    $super(callback, frequency);
3637    this.element   = $(element);
3638    this.lastValue = this.getValue();
3639  },
3640
3641  execute: function() {
3642    var value = this.getValue();
3643    if (Object.isString(this.lastValue) && Object.isString(value) ?
3644        this.lastValue != value : String(this.lastValue) != String(value)) {
3645      this.callback(this.element, value);
3646      this.lastValue = value;
3647    }
3648  }
3649});
3650
3651Form.Element.Observer = Class.create(Abstract.TimedObserver, {
3652  getValue: function() {
3653    return Form.Element.getValue(this.element);
3654  }
3655});
3656
3657Form.Observer = Class.create(Abstract.TimedObserver, {
3658  getValue: function() {
3659    return Form.serialize(this.element);
3660  }
3661});
3662
3663/*--------------------------------------------------------------------------*/
3664
3665Abstract.EventObserver = Class.create({
3666  initialize: function(element, callback) {
3667    this.element  = $(element);
3668    this.callback = callback;
3669
3670    this.lastValue = this.getValue();
3671    if (this.element.tagName.toLowerCase() == 'form')
3672      this.registerFormCallbacks();
3673    else
3674      this.registerCallback(this.element);
3675  },
3676
3677  onElementEvent: function() {
3678    var value = this.getValue();
3679    if (this.lastValue != value) {
3680      this.callback(this.element, value);
3681      this.lastValue = value;
3682    }
3683  },
3684
3685  registerFormCallbacks: function() {
3686    Form.getElements(this.element).each(this.registerCallback, this);
3687  },
3688
3689  registerCallback: function(element) {
3690    if (element.type) {
3691      switch (element.type.toLowerCase()) {
3692        case 'checkbox':
3693        case 'radio':
3694          Event.observe(element, 'click', this.onElementEvent.bind(this));
3695          break;
3696        default:
3697          Event.observe(element, 'change', this.onElementEvent.bind(this));
3698          break;
3699      }
3700    }
3701  }
3702});
3703
3704Form.Element.EventObserver = Class.create(Abstract.EventObserver, {
3705  getValue: function() {
3706    return Form.Element.getValue(this.element);
3707  }
3708});
3709
3710Form.EventObserver = Class.create(Abstract.EventObserver, {
3711  getValue: function() {
3712    return Form.serialize(this.element);
3713  }
3714});
3715if (!window.Event) var Event = { };
3716
3717Object.extend(Event, {
3718  KEY_BACKSPACE: 8,
3719  KEY_TAB:       9,
3720  KEY_RETURN:   13,
3721  KEY_ESC:      27,
3722  KEY_LEFT:     37,
3723  KEY_UP:       38,
3724  KEY_RIGHT:    39,
3725  KEY_DOWN:     40,
3726  KEY_DELETE:   46,
3727  KEY_HOME:     36,
3728  KEY_END:      35,
3729  KEY_PAGEUP:   33,
3730  KEY_PAGEDOWN: 34,
3731  KEY_INSERT:   45,
3732
3733  cache: { },
3734
3735  relatedTarget: function(event) {
3736    var element;
3737    switch(event.type) {
3738      case 'mouseover': element = event.fromElement; break;
3739      case 'mouseout':  element = event.toElement;   break;
3740      default: return null;
3741    }
3742    return Element.extend(element);
3743  }
3744});
3745
3746Event.Methods = (function() {
3747  var isButton;
3748
3749  if (Prototype.Browser.IE) {
3750    var buttonMap = { 0: 1, 1: 4, 2: 2 };
3751    isButton = function(event, code) {
3752      return event.button == buttonMap[code];
3753    };
3754
3755  } else if (Prototype.Browser.WebKit) {
3756    isButton = function(event, code) {
3757      switch (code) {
3758        case 0: return event.which == 1 && !event.metaKey;
3759        case 1: return event.which == 1 && event.metaKey;
3760        default: return false;
3761      }
3762    };
3763
3764  } else {
3765    isButton = function(event, code) {
3766      return event.which ? (event.which === code + 1) : (event.button === code);
3767    };
3768  }
3769
3770  return {
3771    isLeftClick:   function(event) { return isButton(event, 0) },
3772    isMiddleClick: function(event) { return isButton(event, 1) },
3773    isRightClick:  function(event) { return isButton(event, 2) },
3774
3775    element: function(event) {
3776      var node = Event.extend(event).target;
3777      return Element.extend(node.nodeType == Node.TEXT_NODE ? node.parentNode : node);
3778    },
3779
3780    findElement: function(event, expression) {
3781      var element = Event.element(event);
3782      if (!expression) return element;
3783      var elements = [element].concat(element.ancestors());
3784      return Selector.findElement(elements, expression, 0);
3785    },
3786
3787    pointer: function(event) {
3788      return {
3789        x: event.pageX || (event.clientX +
3790          (document.documentElement.scrollLeft || document.body.scrollLeft)),
3791        y: event.pageY || (event.clientY +
3792          (document.documentElement.scrollTop || document.body.scrollTop))
3793      };
3794    },
3795
3796    pointerX: function(event) { return Event.pointer(event).x },
3797    pointerY: function(event) { return Event.pointer(event).y },
3798
3799    stop: function(event) {
3800      Event.extend(event);
3801      event.preventDefault();
3802      event.stopPropagation();
3803      event.stopped = true;
3804    }
3805  };
3806})();
3807
3808Event.extend = (function() {
3809  var methods = Object.keys(Event.Methods).inject({ }, function(m, name) {
3810    m[name] = Event.Methods[name].methodize();
3811    return m;
3812  });
3813
3814  if (Prototype.Browser.IE) {
3815    Object.extend(methods, {
3816      stopPropagation: function() { this.cancelBubble = true },
3817      preventDefault:  function() { this.returnValue = false },
3818      inspect: function() { return "[object Event]" }
3819    });
3820
3821    return function(event) {
3822      if (!event) return false;
3823      if (event._extendedByPrototype) return event;
3824
3825      event._extendedByPrototype = Prototype.emptyFunction;
3826      var pointer = Event.pointer(event);
3827      Object.extend(event, {
3828        target: event.srcElement,
3829        relatedTarget: Event.relatedTarget(event),
3830        pageX:  pointer.x,
3831        pageY:  pointer.y
3832      });
3833      return Object.extend(event, methods);
3834    };
3835
3836  } else {
3837    Event.prototype = Event.prototype || document.createEvent("HTMLEvents").__proto__;
3838    Object.extend(Event.prototype, methods);
3839    return Prototype.K;
3840  }
3841})();
3842
3843Object.extend(Event, (function() {
3844  var cache = Event.cache;
3845
3846  function getEventID(element) {
3847    if (element._prototypeEventID) return element._prototypeEventID[0];
3848    arguments.callee.id = arguments.callee.id || 1;
3849    return element._prototypeEventID = [++arguments.callee.id];
3850  }
3851
3852  function getDOMEventName(eventName) {
3853    if (eventName && eventName.include(':')) return "dataavailable";
3854    return eventName;
3855  }
3856
3857  function getCacheForID(id) {
3858    return cache[id] = cache[id] || { };
3859  }
3860
3861  function getWrappersForEventName(id, eventName) {
3862    var c = getCacheForID(id);
3863    return c[eventName] = c[eventName] || [];
3864  }
3865
3866  function createWrapper(element, eventName, handler) {
3867    var id = getEventID(element);
3868    var c = getWrappersForEventName(id, eventName);
3869    if (c.pluck("handler").include(handler)) return false;
3870
3871    var wrapper = function(event) {
3872      if (!Event || !Event.extend ||
3873        (event.eventName && event.eventName != eventName))
3874          return false;
3875
3876      Event.extend(event);
3877      handler.call(element, event);
3878    };
3879
3880    wrapper.handler = handler;
3881    c.push(wrapper);
3882    return wrapper;
3883  }
3884
3885  function findWrapper(id, eventName, handler) {
3886    var c = getWrappersForEventName(id, eventName);
3887    return c.find(function(wrapper) { return wrapper.handler == handler });
3888  }
3889
3890  function destroyWrapper(id, eventName, handler) {
3891    var c = getCacheForID(id);
3892    if (!c[eventName]) return false;
3893    c[eventName] = c[eventName].without(findWrapper(id, eventName, handler));
3894  }
3895
3896  function destroyCache() {
3897    for (var id in cache)
3898      for (var eventName in cache[id])
3899        cache[id][eventName] = null;
3900  }
3901
3902  if (window.attachEvent) {
3903    window.attachEvent("onunload", destroyCache);
3904  }
3905
3906  return {
3907    observe: function(element, eventName, handler) {
3908      element = $(element);
3909      var name = getDOMEventName(eventName);
3910
3911      var wrapper = createWrapper(element, eventName, handler);
3912      if (!wrapper) return element;
3913
3914      if (element.addEventListener) {
3915        element.addEventListener(name, wrapper, false);
3916      } else {
3917        element.attachEvent("on" + name, wrapper);
3918      }
3919
3920      return element;
3921    },
3922
3923    stopObserving: function(element, eventName, handler) {
3924      element = $(element);
3925      var id = getEventID(element), name = getDOMEventName(eventName);
3926
3927      if (!handler && eventName) {
3928        getWrappersForEventName(id, eventName).each(function(wrapper) {
3929          element.stopObserving(eventName, wrapper.handler);
3930        });
3931        return element;
3932
3933      } else if (!eventName) {
3934        Object.keys(getCacheForID(id)).each(function(eventName) {
3935          element.stopObserving(eventName);
3936        });
3937        return element;
3938      }
3939
3940      var wrapper = findWrapper(id, eventName, handler);
3941      if (!wrapper) return element;
3942
3943      if (element.removeEventListener) {
3944        element.removeEventListener(name, wrapper, false);
3945      } else {
3946        element.detachEvent("on" + name, wrapper);
3947      }
3948
3949      destroyWrapper(id, eventName, handler);
3950
3951      return element;
3952    },
3953
3954    fire: function(element, eventName, memo) {
3955      element = $(element);
3956      if (element == document && document.createEvent && !element.dispatchEvent)
3957        element = document.documentElement;
3958
3959      var event;
3960      if (document.createEvent) {
3961        event = document.createEvent("HTMLEvents");
3962        event.initEvent("dataavailable", true, true);
3963      } else {
3964        event = document.createEventObject();
3965        event.eventType = "ondataavailable";
3966      }
3967
3968      event.eventName = eventName;
3969      event.memo = memo || { };
3970
3971      if (document.createEvent) {
3972        element.dispatchEvent(event);
3973      } else {
3974        element.fireEvent(event.eventType, event);
3975      }
3976
3977      return Event.extend(event);
3978    }
3979  };
3980})());
3981
3982Object.extend(Event, Event.Methods);
3983
3984Element.addMethods({
3985  fire:          Event.fire,
3986  observe:       Event.observe,
3987  stopObserving: Event.stopObserving
3988});
3989
3990Object.extend(document, {
3991  fire:          Element.Methods.fire.methodize(),
3992  observe:       Element.Methods.observe.methodize(),
3993  stopObserving: Element.Methods.stopObserving.methodize(),
3994  loaded:        false
3995});
3996
3997(function() {
3998  /* Support for the DOMContentLoaded event is based on work by Dan Webb,
3999     Matthias Miller, Dean Edwards and John Resig. */
4000
4001  var timer;
4002
4003  function fireContentLoadedEvent() {
4004    if (document.loaded) return;
4005    if (timer) window.clearInterval(timer);
4006    document.fire("dom:loaded");
4007    document.loaded = true;
4008  }
4009
4010  if (document.addEventListener) {
4011    if (Prototype.Browser.WebKit) {
4012      timer = window.setInterval(function() {
4013        if (/loaded|complete/.test(document.readyState))
4014          fireContentLoadedEvent();
4015      }, 0);
4016
4017      Event.observe(window, "load", fireContentLoadedEvent);
4018
4019    } else {
4020      document.addEventListener("DOMContentLoaded",
4021        fireContentLoadedEvent, false);
4022    }
4023
4024  } else {
4025    document.write("<script id=__onDOMContentLoaded defer src=//:><\/script>");
4026    $("__onDOMContentLoaded").onreadystatechange = function() {
4027      if (this.readyState == "complete") {
4028        this.onreadystatechange = null;
4029        fireContentLoadedEvent();
4030      }
4031    };
4032  }
4033})();
4034/*------------------------------- DEPRECATED -------------------------------*/
4035
4036Hash.toQueryString = Object.toQueryString;
4037
4038var Toggle = { display: Element.toggle };
4039
4040Element.Methods.childOf = Element.Methods.descendantOf;
4041
4042var Insertion = {
4043  Before: function(element, content) {
4044    return Element.insert(element, {before:content});
4045  },
4046
4047  Top: function(element, content) {
4048    return Element.insert(element, {top:content});
4049  },
4050
4051  Bottom: function(element, content) {
4052    return Element.insert(element, {bottom:content});
4053  },
4054
4055  After: function(element, content) {
4056    return Element.insert(element, {after:content});
4057  }
4058};
4059
4060var $continue = new Error('"throw $continue" is deprecated, use "return" instead');
4061
4062// This should be moved to script.aculo.us; notice the deprecated methods
4063// further below, that map to the newer Element methods.
4064var Position = {
4065  // set to true if needed, warning: firefox performance problems
4066  // NOT neeeded for page scrolling, only if draggable contained in
4067  // scrollable elements
4068  includeScrollOffsets: false,
4069
4070  // must be called before calling withinIncludingScrolloffset, every time the
4071  // page is scrolled
4072  prepare: function() {
4073    this.deltaX =  window.pageXOffset
4074                || document.documentElement.scrollLeft
4075                || document.body.scrollLeft
4076                || 0;
4077    this.deltaY =  window.pageYOffset
4078                || document.documentElement.scrollTop
4079                || document.body.scrollTop
4080                || 0;
4081  },
4082
4083  // caches x/y coordinate pair to use with overlap
4084  within: function(element, x, y) {
4085    if (this.includeScrollOffsets)
4086      return this.withinIncludingScrolloffsets(element, x, y);
4087    this.xcomp = x;
4088    this.ycomp = y;
4089    this.offset = Element.cumulativeOffset(element);
4090
4091    return (y >= this.offset[1] &&
4092            y <  this.offset[1] + element.offsetHeight &&
4093            x >= this.offset[0] &&
4094            x <  this.offset[0] + element.offsetWidth);
4095  },
4096
4097  withinIncludingScrolloffsets: function(element, x, y) {
4098    var offsetcache = Element.cumulativeScrollOffset(element);
4099
4100    this.xcomp = x + offsetcache[0] - this.deltaX;
4101    this.ycomp = y + offsetcache[1] - this.deltaY;
4102    this.offset = Element.cumulativeOffset(element);
4103
4104    return (this.ycomp >= this.offset[1] &&
4105            this.ycomp <  this.offset[1] + element.offsetHeight &&
4106            this.xcomp >= this.offset[0] &&
4107            this.xcomp <  this.offset[0] + element.offsetWidth);
4108  },
4109
4110  // within must be called directly before
4111  overlap: function(mode, element) {
4112    if (!mode) return 0;
4113    if (mode == 'vertical')
4114      return ((this.offset[1] + element.offsetHeight) - this.ycomp) /
4115        element.offsetHeight;
4116    if (mode == 'horizontal')
4117      return ((this.offset[0] + element.offsetWidth) - this.xcomp) /
4118        element.offsetWidth;
4119  },
4120
4121  // Deprecation layer -- use newer Element methods now (1.5.2).
4122
4123  cumulativeOffset: Element.Methods.cumulativeOffset,
4124
4125  positionedOffset: Element.Methods.positionedOffset,
4126
4127  absolutize: function(element) {
4128    Position.prepare();
4129    return Element.absolutize(element);
4130  },
4131
4132  relativize: function(element) {
4133    Position.prepare();
4134    return Element.relativize(element);
4135  },
4136
4137  realOffset: Element.Methods.cumulativeScrollOffset,
4138
4139  offsetParent: Element.Methods.getOffsetParent,
4140
4141  page: Element.Methods.viewportOffset,
4142
4143  clone: function(source, target, options) {
4144    options = options || { };
4145    return Element.clonePosition(target, source, options);
4146  }
4147};
4148
4149/*--------------------------------------------------------------------------*/
4150
4151if (!document.getElementsByClassName) document.getElementsByClassName = function(instanceMethods){
4152  function iter(name) {
4153    return name.blank() ? null : "[contains(concat(' ', @class, ' '), ' " + name + " ')]";
4154  }
4155
4156  instanceMethods.getElementsByClassName = Prototype.BrowserFeatures.XPath ?
4157  function(element, className) {
4158    className = className.toString().strip();
4159    var cond = /\s/.test(className) ? $w(className).map(iter).join('') : iter(className);
4160    return cond ? document._getElementsByXPath('.//*' + cond, element) : [];
4161  } : function(element, className) {
4162    className = className.toString().strip();
4163    var elements = [], classNames = (/\s/.test(className) ? $w(className) : null);
4164    if (!classNames && !className) return elements;
4165
4166    var nodes = $(element).getElementsByTagName('*');
4167    className = ' ' + className + ' ';
4168
4169    for (var i = 0, child, cn; child = nodes[i]; i++) {
4170      if (child.className && (cn = ' ' + child.className + ' ') && (cn.include(className) ||
4171          (classNames && classNames.all(function(name) {
4172            return !name.toString().blank() && cn.include(' ' + name + ' ');
4173          }))))
4174        elements.push(Element.extend(child));
4175    }
4176    return elements;
4177  };
4178
4179  return function(className, parentElement) {
4180    return $(parentElement || document.body).getElementsByClassName(className);
4181  };
4182}(Element.Methods);
4183
4184/*--------------------------------------------------------------------------*/
4185
4186Element.ClassNames = Class.create();
4187Element.ClassNames.prototype = {
4188  initialize: function(element) {
4189    this.element = $(element);
4190  },
4191
4192  _each: function(iterator) {
4193    this.element.className.split(/\s+/).select(function(name) {
4194      return name.length > 0;
4195    })._each(iterator);
4196  },
4197
4198  set: function(className) {
4199    this.element.className = className;
4200  },
4201
4202  add: function(classNameToAdd) {
4203    if (this.include(classNameToAdd)) return;
4204    this.set($A(this).concat(classNameToAdd).join(' '));
4205  },
4206
4207  remove: function(classNameToRemove) {
4208    if (!this.include(classNameToRemove)) return;
4209    this.set($A(this).without(classNameToRemove).join(' '));
4210  },
4211
4212  toString: function() {
4213    return $A(this).join(' ');
4214  }
4215};
4216
4217Object.extend(Element.ClassNames.prototype, Enumerable);
4218
4219/*--------------------------------------------------------------------------*/
4220
4221Element.addMethods();