function showtab(element1,element2)
{
	
	document.getElementById('advertisement').style.display="none";
	document.getElementById('hottestoffers').style.display="none";
	var element=document.getElementById(element1);
	element.style.display="block";
	
	document.getElementById('tab1').className='';
	document.getElementById('tab2').className='';
	document.getElementById(element2).className='selected';
}