var topimg = new Array();
    topimg[0] = "/topimages-forside/top1.png";
var imgno = 0;
    function set_topimg()
    {
      elm=document.getElementById('bg_toppict');
      elm.style.backgroundImage="url("+topimg[imgno]+")";
      imgno++;
      if (imgno>=topimg.length) imgno = 0;
      t=setTimeout("set_topimg()",998000);
    }