if (document.images != null)
   {
   ohneMaus1 = new Image(180,190);
   ohneMaus1.src = "images/menu01a.jpg";
   mitMaus1 = new Image(180,190);
   mitMaus1.src = "images/menu01b.jpg";
   ohneMaus2 = new Image(190,190);
   ohneMaus2.src = "images/menu02a.jpg";
   mitMaus2 = new Image(190,190);
   mitMaus2.src = "images/menu02b.jpg";
   ohneMaus3 = new Image(190,190);
   ohneMaus3.src = "images/menu03a.jpg";
   mitMaus3 = new Image(190,190);
   mitMaus3.src = "images/menu03b.jpg";
   ohneMaus4 = new Image(190,190);
   ohneMaus4.src = "images/menu04a.jpg";
   mitMaus4 = new Image(190,190);
   mitMaus4.src = "images/menu04b.jpg";
   ohneMaus5 = new Image(180,190);
   ohneMaus5.src = "images/menu05a.jpg";
   mitMaus5 = new Image(180,190);
   mitMaus5.src = "images/menu05b.jpg";
   }
function wechsleBild(bild,ziel)
   {
   if(document.images != null)
      {
      document.images[ziel].src = eval(bild +".src")
      return true;
      }
   }