function big(lyr) 
{
	try
	{
		document.getElementById(lyr).style.visibility='visible'; 
	}
	catch(e)
	{
		alert(e);
	}
}

function small(lyr) 
{
	document.getElementById(lyr).style.visibility='hidden'; 
}
function start() 
{
	// NE RIEN FAIRE
}