function preloadImages() {
  var myimages = new Array();
  for (i=0; i<preloadImages.arguments.length; i++) {
    myimages[i] = new Image();
    myimages[i].src = "/images/"+preloadImages.arguments[i];
  }
}

preloadImages("topbg.gif","footerbg.gif","toptree.jpg","topzoolook.jpg","contentsbg.gif");