function showtab(element1,element2)
{
	
	document.getElementById('algo').style.display="none";
	document.getElementById('dt').style.display = "none";
	document.getElementById('ibt').style.display = "none";
	document.getElementById('rms').style.display = "none";
	var element=document.getElementById(element1);
	element.style.display="block";
	
	document.getElementById('tab1').className='';
	document.getElementById('tab2').className = '';
	document.getElementById('tab3').className = '';
	document.getElementById('tab4').className = '';	
	document.getElementById(element2).className='selected';
}