function SwapImage(ImageName,ImageFile){
         Image1=new Image(119,39);
         Image1.src = ImageFile;
         document[ImageName].src = Image1.src;
         return true;
}

function anzeigen () {
        document.getElementById("untermenue").style.visibility = "visible";
}
function nichtanzeigen () {
        document.getElementById("untermenue").style.visibility = "hidden";
}