/* ----- nav.js ----- */
var menuHideTimer = null;
var allMenus = ['layerA','layerB','layerC','layerD'];
var hideDelay = 150;

function ShowMenu(id) {
	clearTimeout(menuHideTimer);
	menuHideTimer = null;
	activeMenu = id;
	document.getElementById(activeMenu).style.visibility='visible';
	for (i = 0; i < allMenus.length; i++) {
		if (allMenus[i] !== activeMenu) {
		document.getElementById(allMenus[i]).style.visibility='hidden';
		}
	}
}

function ChangeVis(id) { document.getElementById(id).style.visibility='hidden'; }

function HideMenu(id) {
	activeMenu = id;
	menuHideTimer = setTimeout('ChangeVis(activeMenu)',hideDelay);
}
/* ----- */