function getRef(obj)
{
	objRef = eval(document.getElementById(obj));
	return objRef;
}

function showLayer(layer)
{
	var	objRef = getRef(layer);
	objRef.style.visibility = "visible";
	objRef.style.display = '';
}

function closeLayer(layer)
{
	var	objRef = getRef(layer);
	objRef.style.visibility = "hidden";
	objRef.style.display = 'none';
}