function preload() {
  Bild1 = new Image();
  Bild1.src = "fileadmin/templates/img/nav_act.jpg";
  Bild2 = new Image();
  Bild2.src = "fileadmin/templates/img/nav_trenner.gif";
  Bild3 = new Image();
  Bild3.src = "fileadmin/templates/img/navi_li.gif";
  Bild4 = new Image();
  Bild4.src = "fileadmin/templates/img/navigation.jpg";
  Bild5 = new Image();
  Bild5.src = "fileadmin/templates/img/unternavi.gif";
  Bild6 = new Image();
  Bild6.src = "fileadmin/templates/img/unternavi_bottom.gif";
  Bild7 = new Image();
  Bild7.src = "fileadmin/templates/img/unternavi_top.gif";
}