// JavaScript Document
/*
Global "swap" holder
Use value, null, if no layer initially visible
*/
var currLayerId = "contract99";

function togLayer(id) {
	if (currLayerId) 
		setDisplay(currLayerId, "none");
	if (id)setDisplay(id, "block");
		currLayerId = id;
}

function setDisplay(id, value) {
	var elm = document.getElementById(id);
	elm.style.display = value;
}