Normal1 = new Image();
       Normal1.src = "gfx/button_1.jpg";
       Highlight1 = new Image();
       Highlight1.src = "gfx/button_1h.jpg";

       Normal2 = new Image();
       Normal2.src = "gfx/button_2.jpg";
       Highlight2 = new Image();
       Highlight2.src = "gfx/button_2h.jpg";

       Normal3 = new Image();
       Normal3.src = "gfx/button_3.jpg";
       Highlight3 = new Image();
       Highlight3.src = "gfx/button_3h.jpg";

       Normal4 = new Image();
       Normal4.src = "gfx/button_4.jpg";
       Highlight4 = new Image();
       Highlight4.src = "gfx/button_4h.jpg";

       Normal5 = new Image();
       Normal5.src = "gfx/button_5.jpg";
       Highlight5 = new Image();
       Highlight5.src = "gfx/button_5h.jpg";

       Normal6 = new Image();
       Normal6.src = "gfx/button_6.jpg";
       Highlight6 = new Image();
       Highlight6.src = "gfx/button_6h.jpg";

       function Bildwechsel (Bildnr, Bildobjekt) {
       window.document.images[Bildnr].src = Bildobjekt.src;
       }