var SubOpen;
var PrevLayer;
var PrevSubLayer;
//var z;
//var y;

function showlayer(z)
{
	lname="Layer" + z;
	document.all(lname).style.visibility="visible";
	PrevLayer = lname;
}

function hidelayer(z)
{
	if(SubOpen == false)
	{
		lname="Layer" + z;
		document.all(lname).style.visibility="hidden";
	}
}
function showsublayer(y)
{
	sublname= "sublayer" + y;
	document.getElementById(sublname).style.visibility = "visible";
	SubOpen = true;
	PrevSubLayer = sublname;
}
	
function hidesublayer(y)
{
	sublname = "sublayer" + y;
	document.getElementById(sublname).style.visibility = "hidden";
	SubOpen = false;
}
function startlayer(z)
{
	if (PrevLayer != "") 
	{
		document.all(PrevLayer).style.visibility = "visible";	
	}
	
	if (PrevSubLayer != "") 
	{
		document.all(PrevSubLayer).style.visibility = "visible";	
	}
	lname = "Layer" + z;
	document.all(lname).style.visibility="visible";
	PrevLayer = lname;
}