function toggleLayer(whichlayer)
{
	var stato = document.getElementById(whichlayer).style.display;										
	if( stato=='block' )
	{
	document.getElementById(whichlayer).style.display='none'; 					
	}else
	{
	document.getElementById(whichlayer).style.display='block'; 
	}
}

function displaypop(whichlayer)
{
		document.getElementById(whichlayer).style.display='block'; 
}
function hidepop(whichlayer)
{
		document.getElementById(whichlayer).style.display='none'; 
}