function newImage(arg) {
 if (document.images) {
  rslt = new Image()
  rslt.src = arg
  return rslt
 }
}
function preloadImages(){
if (document.images){
inlog_a = newImage("/images/submit_a.gif");
zoek_a = newImage("/images/vind_a.gif");
bg_menu = newImage("/images/menu_bg_a.gif");
}
}