var Tabs=new Class({Implements:[Events,Options],options:{},initialize:function(tabsNav,tabsBody,options){this.setOptions(options);this.tNav=tabsNav;this.tBody=tabsBody;this.attach()},attach:function(){this.tNav.each(function(tab,index){tab.addEvent("click",this.resize.bindWithEvent(this,index))},this)},alteredHeight:function(index){return this.tBody[index].measure(function(){return this.getSize().y})},resize:function(e,index){e.stop();this.tNav.getParent().set("class","inactive");this.tNav[index].getParent().set("class","active");var container=this.tBody.getParent();container.set("tween",{transition:"sine:out"});container.tween("height",this.alteredHeight(index));this.tBody.set("styles",{position:"absolute",top:0}).fade("out");this.tBody[index].set("styles",{position:"relative",display:"block",opacity:0}).fade("in")}});