TabControl={tabs:[],currentTab:null,register:function(tab){tab.deactivate();if(!this.tabs.length){tab.activate()}this.tabs.push(tab)},notify:function(tab){cTab=this.currentTab;if(cTab){cTab.deactivate()}this.currentTab=tab}};Tab=Class.create({tab:null,tabContent:null,controller:null,initialize:function(tab,tabContent){this.tab=$(tab);this.tabContent=$(tabContent);TabControl.register(this);Event.observe(this.tab,"click",this.activate.bindAsEventListener(this))},activate:function(){TabControl.notify(this);this.tab.addClassName("tab-on");this.tab.removeClassName("tab-off");this.tabContent.show()},deactivate:function(){this.tab.addClassName("tab-off");this.tab.removeClassName("tab-on");this.tabContent.hide()}});document.observe("dom:loaded",function(){if($("features-tab")){new Tab("features-tab","features");new Tab("specifications-tab","specifications");new Tab("warranty-tab","warranty");new Tab("customer-service-tab","customer-service")}});