<!-- Layer Script (Menufunktion über Layer)-->
function show(text) {
	obj = eval(text);
	if(document.layers) {
		obj.visibility = "show";
	}
	if(document.all) {
		obj.style.visibility = "visible";
	}
}

function hide(text) {			
	obj = eval(text);
	if(document.layers) {
		obj.visibility = "hide";
	}
	if(document.all) {
		obj.style.visibility = "hidden";
	}
}
<!-- End Layer Script -->