function afficheClass1()
{
	document.getElementById('1').style.visibility='visible';
	document.getElementById('1').style.display='block';
	
		
	
		 	
		document.getElementById('2').style.visibility='hidden';
		document.getElementById('2').style.display='none';
		
	

}


function afficheClass2()
{
	document.getElementById('2').style.visibility='visible';
	document.getElementById('2').style.display='block';
	
		 	
		document.getElementById('1').style.visibility='hidden';
		document.getElementById('1').style.display='none';
		
	
		
	

}