ie4 = ((navigator.appName == "Microsoft Internet Explorer") && (parseInt(navigator.appVersion) >= 4 )) 
ns4 = ((navigator.appName == "Netscape") && (parseInt(navigator.appVersion) >= 4 )) 

layerRef="document.all"; 
styleRef=".style"; 

function showSubmenu(Submenu) 
{ 
eval(layerRef + '["' + Submenu +'"]' + styleRef + '.visibility = "visible"'); 
} 

function hideSubmenu(Submenu) 
{ 
eval(layerRef + '["' + Submenu +'"]' + styleRef + '.visibility = "hidden"'); 
} 

function newImage(arg) {
	if (document.images) {
		rslt = new Image();
		rslt.src = arg;
		return rslt;
	}
}

function changeImages() {
	if (document.images && (preloadFlag == true)) {
		for (var i=0; i<changeImages.arguments.length; i+=2) {
			document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
		}
	}
}

var preloadFlag = false;
function preloadImages() {
	if (document.images) {
		nav1_01_Imagemap_01_over = newImage("Bilder/nav1_01-Imagemap_01_over.gif");
		nav1_01_Imagemap_02_over = newImage("Bilder/nav1_01-Imagemap_02_over.gif");
		nav1_01_Imagemap_03_over = newImage("Bilder/nav1_01-Imagemap_03_over.gif");
		nav1_01_Imagemap_04_over = newImage("Bilder/nav1_01-Imagemap_04_over.gif");
		preloadFlag = true;
	}
}