var isDHTML = 0;
var isID = 0;
var isAll = 0;
var isLayers = 0;

if (document.getElementByID){isID = 1; isDHTML = 1;}
else	{
	if (document.all){isAll = 1; isDHTML = 1;}
	else	{
		browserVersion = parseInt(navigator.appVersion);
		if ((navigator.appName.indexOf('Netscape') != -1) && (browserVersion == 4)) 
		 	{isLayers = 1; isDHTML = 1;}
	}
}

function findDOM(objectID, withStyle) {
	if (withStyle == 1) {
		if (isID) {return (document.getElementByID(objectID).style);}
		else{
			if (isAll){return (document.all[objectID].style);}
			else{
				if (isLayers) {	return (document.layers[objectID]);}
			}
		}
	}
	else{
		if (isID) {return (document.getElementByID(objectID));}
		else{
			if (isAll){return (document.all[objectID]);}
			else{
				if (isLayers) {	return (document.layers[objectID]);}
			}
		}
	}
}

function toggleMenu(vMenu) {
	if (isAll || isID && (navigator.appName.indexOf('Opera') != 0 || 
		(navigator.appName.indexOf('Opera') == 0 && parseInt(navigator.appVersion.substring(0,1))>6)))
		{
			domStyleMSub = findDOM(vMenu,1);
			if (domStyleMSub.display == 'block') {domStyleMSub.display='none';}
			else{domStyleMSub.display='block';}
		}
	else{alert('dieser Browser unterstützt nicht das DOM des W3C');}
}