function randomImage() {
var imglist = new Array(
      "/nc/skins/share/images/pagetitle_top01.gif",
      "/nc/skins/share/images/pagetitle_top02.gif",
      "/nc/skins/share/images/pagetitle_top03.gif",
      "/nc/skins/share/images/pagetitle_top04.gif",
      "/nc/skins/share/images/pagetitle_top05.gif");
   var selectnum = Math.floor((Math.random() * 100)) % imglist.length;
   var output = "<img src=" + imglist[selectnum] + ">";
   document.write(output);
   }