if (document.images)
 {
   var path="";
   var load = "no";
   //main menu
   image1on = imageLoad(path, "1_");
   image1off = imageLoad(path, "1__");
   image2on = imageLoad(path, "2_");
   image2off = imageLoad(path, "2");
   image3on = imageLoad(path, "3_");
   image3off = imageLoad(path, "3");
   image4on = imageLoad(path, "4_");
   image4off = imageLoad(path, "4");

   load = "yes";
  }

  function imageLoad(path, imgname)
  {
    image = new Image(); image.src = path+"images/menu/"+imgname+".jpg";
    return image;
   }
  function imageOff(imgName)
  {
    if (load == "yes") {if (document.images) {document.images[imgName].src = eval(imgName + "off.src");}}
   }
  function imageOn(imgName)
  {
    if (load == "yes") {if (document.images) {document.images[imgName].src = eval(imgName + "on.src");}}
   }