var Ajax = {  getTransport: function() {    return Try.these(      function() {return new ActiveXObject('Msxml2.XMLHTTP')},      function() {return new ActiveXObject('Microsoft.XMLHTTP')},      function() {return new XMLHttpRequest()}    ) || false;  },    activeRequestCount: 0}Ajax.Responders = {  responders: [],    _each: function(iterator) {    this.responders._each(iterator);  },  register: function(responderToAdd) {    if (!this.include(responderToAdd))      this.responders.push(responderToAdd);  },    unregister: function(responderToRemove) {    this.responders = this.responders.without(responderToRemove);  },    dispatch: function(callback, request, transport, json) {    this.each(function(responder) {      if (responder[callback] && typeof responder[callback] == 'function') {        try {          responder[callback].apply(responder, [request, transport, json]);        } catch (e) {}      }    });  }};Object.extend(Ajax.Responders, Enumerable);Ajax.Responders.register({  onCreate: function() {    Ajax.activeRequestCount++;  },    onComplete: function() {    Ajax.activeRequestCount--;  }});Ajax.Base = function() {};Ajax.Base.prototype = {  setOptions: function(options) {    this.options = {      method:       'post',      asynchronous: true,      parameters:   ''    }    Object.extend(this.options, options || {});  },  responseIsSuccess: function() {    return this.transport.status == undefined        || this.transport.status == 0         || (this.transport.status >= 200 && this.transport.status < 300);  },  responseIsFailure: function() {    return !this.responseIsSuccess();  }}Ajax.Request = Class.create();Ajax.Request.Events =   ['Uninitialized', 'Loading', 'Loaded', 'Interactive', 'Complete'];Ajax.Request.prototype = Object.extend(new Ajax.Base(), {  initialize: function(url, options) {    this.transport = Ajax.getTransport();    this.setOptions(options);    this.request(url);  },  request: function(url) {    var parameters = this.options.parameters || '';    if (parameters.length > 0) parameters += '&_=';    try {      this.url = url;      if (this.options.method == 'get' && parameters.length > 0)        this.url += (this.url.match(/\?/) ? '&' : '?') + parameters;            Ajax.Responders.dispatch('onCreate', this, this.transport);            this.transport.open(this.options.method, this.url,         this.options.asynchronous);      if (this.options.asynchronous) {        this.transport.onreadystatechange = this.onStateChange.bind(this);        setTimeout((function() {this.respondToReadyState(1)}).bind(this), 10);      }      this.setRequestHeaders();      var body = this.options.postBody ? this.options.postBody : parameters;      this.transport.send(this.options.method == 'post' ? body : null);    } catch (e) {      this.dispatchException(e);    }  },  setRequestHeaders: function() {    var requestHeaders =       ['X-Requested-With', 'XMLHttpRequest',       'X-Prototype-Version', Prototype.Version];    if (this.options.method == 'post') {      requestHeaders.push('Content-type',         'application/x-www-form-urlencoded');      /* Force "Connection: close" for Mozilla browsers to work around       * a bug where XMLHttpReqeuest sends an incorrect Content-length       * header. See Mozilla Bugzilla #246651.        */      if (this.transport.overrideMimeType)        requestHeaders.push('Connection', 'close');    }    if (this.options.requestHeaders)      requestHeaders.push.apply(requestHeaders, this.options.requestHeaders);    for (var i = 0; i < requestHeaders.length; i += 2)      this.transport.setRequestHeader(requestHeaders[i], requestHeaders[i+1]);  },  onStateChange: function() {    var readyState = this.transport.readyState;    if (readyState != 1)      this.respondToReadyState(this.transport.readyState);  },    header: function(name) {    try {      return this.transport.getResponseHeader(name);    } catch (e) {}  },    evalJSON: function() {    try {      return eval(this.header('X-JSON'));    } catch (e) {}  },    evalResponse: function() {    try {      return eval(this.transport.responseText);    } catch (e) {      this.dispatchException(e);    }  },  respondToReadyState: function(readyState) {    var event = Ajax.Request.Events[readyState];    var transport = this.transport, json = this.evalJSON();    if (event == 'Complete') {      try {        (this.options['on' + this.transport.status]         || this.options['on' + (this.responseIsSuccess() ? 'Success' : 'Failure')]         || Prototype.emptyFunction)(transport, json);      } catch (e) {        this.dispatchException(e);      }            if ((this.header('Content-type') || '').match(/^text\/javascript/i))        this.evalResponse();    }        try {      (this.options['on' + event] || Prototype.emptyFunction)(transport, json);      Ajax.Responders.dispatch('on' + event, this, transport, json);    } catch (e) {      this.dispatchException(e);    }        /* Avoid memory leak in MSIE: clean up the oncomplete event handler */    if (event == 'Complete')      this.transport.onreadystatechange = Prototype.emptyFunction;  },    dispatchException: function(exception) {    (this.options.onException || Prototype.emptyFunction)(this, exception);    Ajax.Responders.dispatch('onException', this, exception);  }});Ajax.Updater = Class.create();Object.extend(Object.extend(Ajax.Updater.prototype, Ajax.Request.prototype), {  initialize: function(container, url, options) {    this.containers = {      success: container.success ? $(container.success) : $(container),      failure: container.failure ? $(container.failure) :        (container.success ? null : $(container))    }    this.transport = Ajax.getTransport();    this.setOptions(options);    var onComplete = this.options.onComplete || Prototype.emptyFunction;    this.options.onComplete = (function(transport, object) {      this.updateContent();      onComplete(transport, object);    }).bind(this);    this.request(url);  },  updateContent: function() {    var receiver = this.responseIsSuccess() ?      this.containers.success : this.containers.failure;    var response = this.transport.responseText;        if (!this.options.evalScripts)      response = response.stripScripts();    if (receiver) {      if (this.options.insertion) {        new this.options.insertion(receiver, response);      } else {        Element.update(receiver, response);      }    }    if (this.responseIsSuccess()) {      if (this.onComplete)        setTimeout(this.onComplete.bind(this), 10);    }  }});Ajax.PeriodicalUpdater = Class.create();Ajax.PeriodicalUpdater.prototype = Object.extend(new Ajax.Base(), {  initialize: function(container, url, options) {    this.setOptions(options);    this.onComplete = this.options.onComplete;    this.frequency = (this.options.frequency || 2);    this.decay = (this.options.decay || 1);        this.updater = {};    this.container = container;    this.url = url;    this.start();  },  start: function() {    this.options.onComplete = this.updateComplete.bind(this);    this.onTimerEvent();  },  stop: function() {    this.updater.onComplete = undefined;    clearTimeout(this.timer);    (this.onComplete || Prototype.emptyFunction).apply(this, arguments);  },  updateComplete: function(request) {    if (this.options.decay) {      this.decay = (request.responseText == this.lastText ?         this.decay * this.options.decay : 1);      this.lastText = request.responseText;    }    this.timer = setTimeout(this.onTimerEvent.bind(this),       this.decay * this.frequency * 1000);  },  onTimerEvent: function() {    this.updater = new Ajax.Updater(this.container, this.url, this.options);  }});