//set up the browsers
var ns4 = (document.layers);
var ie4 = (document.all && !document.getElementById);
var DOM = (document.getElementById);
// set up the initial variables for the hidden menu positions
var starttopMenu1 = -1;
var starttopMenu2 = -1;
var starttopMenu3 = -1;
var starttopMenu4 = -1;

function show(id){

	if(ns4){
		document.layers[id].visibility = "show";
	}
	else if(ie4){
		document.all[id].style.visibility = "visible";
	}
	else if(DOM){
	scrollY = document.body.scrollTop;
	document.getElementById(id).style.visibility = "visible";
	}
}



function hideAll(){

	if(ns4){
		 document.layers['topMenu1'].visibility = "hide";
		 document.layers['topMenu2'].visibility = "hide";
		 document.layers['topMenu3'].visibility = "hide";
		 		 document.layers['topMenu4'].visibility = "hide";
	}
	else if(ie4){
		document.all['topMenu1'].style.visibility = "hidden";
		document.all['topMenu2'].style.visibility = "hidden";
		document.all['topMenu3'].style.visibility = "hidden";
		document.all['topMenu4'].style.visibility = "hidden";
	}
	else if(DOM){
		document.getElementById('topMenu1').style.visibility = "hidden";
		document.getElementById('topMenu2').style.visibility = "hidden";
		document.getElementById('topMenu3').style.visibility = "hidden";
		document.getElementById('topMenu4').style.visibility = "hidden";
	}
}

// timeout to hide popup menus
var cleared = true;
function hideInt() {
if (cleared==true) {
t = window.setTimeout('hideAll()',750);
cleared = false;
}
}
function clearInt() {
if (cleared==false) {
window.clearTimeout(t);
cleared = true;
}
}