function random_banner(DKademe){
  var i=0;
  banners = new Array();
  banners[0] = "<img border='0' src='" + DKademe + "images/banner0.jpg" + "' width='948' height='83'";
  banners[1] = "<img border='0' src='" + DKademe + "images/banner1.jpg" + "' width='948' height='83'";
  banners[2] = "<img border='0' src='" + DKademe + "images/banner2.jpg" + "' width='948' height='83'";
  today = new Date();
  i=today.getSeconds();
  n=banners.length;
  return banners[i-Math.round((i-1)/n)*n];
}