function hideall(index) {
	var count=1;
	while (document.getElementById("L"+count)!=null) {
		var rec=document.getElementById("L"+count);
		rec.style.visibility="hidden";
		count++;
	};
	for (count=1; count<6; count++) {
		var current = document.getElementById("H"+count);
		current.style.backgroundColor="#FFFFFF";
	};
};
		
function showlayer(id) {
	hideall(0);
	var layer=document.getElementById("L"+id);
	layer.style.visibility="visible";
	var selected = document.getElementById("H"+id);
	selected.style.backgroundColor="#00FF66";
};