browserName = navigator.appName;
browserVer = parseInt(navigator.appVersion);

var ns = (browserName == "Netscape" && browserVer <5);
var ns6 = (browserName == "Netscape" && browserVer == 5);
var ie = (browserName == "Microsoft Internet Explorer");
var mac = (navigator.userAgent.indexOf("Mac") != -1);

function visible(lelayer) {
	if (ns) { 
		document.layers[lelayer].visibility="show"; 
		document.layers["submenus"].visibility="show"; }
	else if (ie) { 
		document.all[lelayer].style.visibility="visible"; 
		document.all["submenus"].style.visibility="visible";
		
		
		var poz = (document.body.offsetWidth-1020)/2;		/*976-923-792*/
		document.all["submenus"].style.left=""+poz+"px";}
	else if (ns6) { 
		document.getElementById(lelayer).style.visibility="visible"; 
		document.getElementById("submenus").style.visibility="visible";
		
		
		var poz = (document.body.offsetWidth-1020)/2;		/*976-923-792*/
		document.getElementById("submenus").style.left=""+poz+"px"}
}

function invisible(lelayer) {
	if (ns) { 
		document.layers[lelayer].visibility="hide"; 
		document.layers["submenus"].visibility="hide"; }
	else if (ie) { 
		document.all[lelayer].style.visibility="hidden"; 
		document.all["submenus"].style.visibility="hidden"; }
	else if (ns6) { 
		document.getElementById(lelayer).style.visibility="hidden"; 
		document.getElementById("submenus").style.visibility="hidden"; }
}