function show_random_image() {
  var fpath = '/fileadmin/e_tream/pageLayout/images/banners/';
//  var fpath = 'images/banners/';
  var d1 = document;
  
  d1.lastSlide = 5;
  d1.curSlide = Math.round(Math.random() * (d1.lastSlide-1)) + 1;

  var bannerDiv = document.getElementById("banner");
  var bild = "<img src=\"" + fpath + "banner" + d1.curSlide + ".jpg\" alt=\"\" height=\"196\" />";
  document.getElementById("banner").innerHTML = bild;
}