var ProtoTabs = Class.create();
ProtoTabs.prototype = {

	initialize: function(element, options) {
		this.options = Object.extend({
			defaultPanel: '',
			ajaxUrls: 			{},
			ajaxLoadingText: 	'Loading...'
		}, options || {});

		this.currentTab = '';

		this.element = $(element);
		this.listElements = $A(this.element.getElementsByTagName('LI'));

		for(i = 0; i < this.listElements.length; i++) {

			tabLI = this.listElements[i];
			var itemLinks = tabLI.getElementsByTagName('A');
			tabLI.itemId = itemLinks[0].href.split("#")[1];
			tabLI.linkedPanel = $(tabLI.itemId);
			tabLI.linkedPanel.style.clear = "both";		

			if((this.options.defaultPanel != '') && (this.options.defaultPanel == tabLI.itemId)){
				this.openPanel(tabLI);
			}else{
				$($(tabLI).linkedPanel).hide();
			}

			$(itemLinks[0]).observe('click', function(event){
					element = Event.findElement(event, 'LI');
					this.openPanel(element);
					Event.stop(event); 
			}.bind(this));
		}

	},

	openPanel: function(tab){
		tab = $(tab); 

		if(this.currentTab != ''){
			this.currentTab.linkedPanel.hide();
			this.currentTab.removeClassName('selected');
		}

		this.currentTab = tab;

		tab.linkedPanel.show();
		tab.addClassName('selected');
		var url = this.options.ajaxUrls[tab.itemId];

		if(url != undefined){
			tab.linkedPanel.update(this.options.ajaxLoadingText);
			new Ajax.Request(url,{
				onComplete: function(transport) {
					tab.linkedPanel.update(transport.responseText);
				}
			});
		}

	}
};