var chkBrowser = (navigator.appName);

if (chkBrowser == "Microsoft Internet Explorer"){
	var browser = "ie";
}
else{
	var browser = "nn";
}

menu1 ="about";
menu2 ="product";

function menuReset() {
	if (browser == "ie"){
		document.all.about.style.visibility="hidden";
		document.all.product.style.visibility="hidden";
		
	}
	else {
		document.layers.about.visiblility="hidden";
		document.layers.product.visiblility="hidden";
		
	}
}

function menuOn(menu){
	menuReset();
	if (browser == "ie"){
		document.all[menu].style.visibility="visible";
	}
	else {
		document.layers[menu].visibility="visible";
	}
}


function menuSet(){
	menuReset();
}