function over(typ){
var pfad = "images/"+typ+"_over.gif";
if (document.images){
if (document.layers){
document.menu.document.images[typ].src = pfad;}
else{
document.images[typ].src = pfad;}}
}

function out(typ){
var pfad = "images/"+typ+".gif";
if (document.images){
if (document.layers){
document.menu.document.images[typ].src = pfad;}
else{
document.images[typ].src = pfad;}}
}

function preload(){
var img;
for (var i=0; i<preload.arguments.length;i++){
img = new Image();
img.src = preload.arguments[i];
}}

preload('images/grafik_over.gif','images/web_over.gif','images/schulungen_over.gif','images/wuu_over.gif','images/kontakt_over.gif')