image1 = new Image();
  image1.src = "/images/menu/1on.jpg";
  image2 = new Image();
  image2.src = "/images/menu/2on.jpg";
  image3 = new Image();
  image3.src = "/images/menu/3on.jpg";
  image4 = new Image();
  image4.src = "/images/menu/4on.jpg";
  image5 = new Image();
  image5.src = "/images/menu/5on.jpg";
  image6 = new Image();
  image6.src = "/images/menu/6on.jpg";