var ns = document.layers;
var ie = document.all;
var w3c = document.documentElement;
var menOpen = false;
var timerOn = false;

function get_element(name) {
    if(w3c||navigator.userAgent.indexOf("Opera") != -1) {
    return document.getElementById(name);
	}
	else if(ns) {
	return eval("document." + name);
	}
	if(ie) {
	return eval("document.all." + name);
	}
    
}

function checkTimer() {
	if (timerOn) {
		clearTimeout(timerOn);
		timerOn = false;
	}
}

function startTimer() {
	timerOn = setTimeout("show();", 10);
}

function weg() {
	if (menOpen) {
 		checkTimer();
		if ((ns)&&(document.layers[menOpen])) {
			document.layers[menOpen].visibility = "hide";
		  }
		if ((!ns)&&(get_element(menOpen))) { 
		get_element(menOpen).style.visibility = "hidden";
		}
		menOpen = false;
	}
}

function show(welches){
	weg();
	if (welches) {
		if ((ns)&&(document.layers[welches])) {
			document.layers[welches].visibility = "show";
		}
		if ((!ns)&&(get_element(welches))) {
			get_element(welches).style.visibility = "visible";
		}
		if (get_element(welches)) {
			get_element(welches).onmouseover = checkTimer;
			get_element(welches).onmouseout = startTimer;
		}
		menOpen = welches;
	}
}