var Field={clear:function(){for(var i=0;i<arguments.length;i++)$(arguments[i]).value='';},focus:function(element){$(element).focus();},present:function(){for(var i=0;i<arguments.length;i++)if($(arguments[i]).value=='')return false;return true;},select:function(element){$(element).select();},activate:function(element){$(element).focus();$(element).select();}};var Form={serialize:function(form){var elements=Form.getElements($(form));var queryComponents=new Array();for(var i=0;i<elements.length;i++){var queryComponent=Form.Element.serialize(elements[i]);if(queryComponent)queryComponents.push(queryComponent);};return queryComponents.join('&');},getElements:function(form){form=$(form);var elements=new Array();for(tagName in Form.Element.Serializers){var tagElements=form.getElementsByTagName(tagName);for(var j=0;j<tagElements.length;j++)elements.push(tagElements[j]);};return elements;},disable:function(form){var elements=Form.getElements(form);for(var i=0;i<elements.length;i++){var element=elements[i];element.blur();element.disable='true';}},focusFirstElement:function(form){form=$(form);var elements=Form.getElements(form);for(var i=0;i<elements.length;i++){var element=elements[i];if(element.type!='hidden'&&!element.disabled){Field.activate(element);break;}}},reset:function(form){$(form).reset();}};Form.Element={serialize:function(element){element=$(element);var method=element.tagName.toLowerCase();var parameter=Form.Element.Serializers[method](element);if(parameter)return encodeURIComponent(parameter[0])+'='+encodeURIComponent(parameter[1]);},getValue:function(element){element=$(element);var method=element.tagName.toLowerCase();var parameter=Form.Element.Serializers[method](element);if(parameter)return parameter[1];}};Form.Element.Serializers={input:function(element){switch(element.type.toLowerCase()){case 'hidden':case 'password':case 'text':return Form.Element.Serializers.textarea(element);case 'checkbox':case 'radio':return Form.Element.Serializers.inputSelector(element);};return false;},inputSelector:function(element){if(element.checked)return[element.name,element.value];},textarea:function(element){return[element.name,element.value];},select:function(element){var index=element.selectedIndex;var value=element.options[index].value||element.options[index].text;return[element.name,(index>=0)?value:''];}};var $F=Form.Element.getValue;Abstract.TimedObserver=function(){};Abstract.TimedObserver.prototype={initialize:function(element,frequency,callback){this.frequency=frequency;this.element=$(element);this.callback=callback;this.lastValue=this.getValue();this.registerCallback();},registerCallback:function(){setTimeout(this.onTimerEvent.bind(this),this.frequency*1000);},onTimerEvent:function(){var value=this.getValue();if(this.lastValue!=value){this.callback(this.element,value);this.lastValue=value;};this.registerCallback();}};Form.Element.Observer=Class.create();Form.Element.Observer.prototype=(new Abstract.TimedObserver()).extend({getValue:function(){return Form.Element.getValue(this.element);}});Form.Observer=Class.create();Form.Observer.prototype=(new Abstract.TimedObserver()).extend({getValue:function(){return Form.serialize(this.element);}});