if (document.images) {
  Blank = new Image();
  Blank.src = "gallery/blank.gif";

  GalleryOn = new Image();
  GalleryOn.src = "images/menu-gallery-on.gif";

  AboutOn = new Image();
  AboutOn.src = "images/menu-about-on.gif";

  ContactOn = new Image();
  ContactOn.src = "images/menu-contact-on.gif";

  ExhibitsOn = new Image();
  ExhibitsOn.src = "images/menu-exhibits-on.gif";



  GalleryOff = new Image();
  GalleryOff.src = "images/menu-gallery.gif";

  AboutOff = new Image();
  AboutOff.src = "images/menu-about.gif";

  ContactOff = new Image();
  ContactOff.src = "images/menu-contact.gif";

  ExhibitsOff = new Image();
  ExhibitsOff.src = "images/menu-exhibits.gif";
}

function changeImages() {
  if (document.images) {
    for (var i=0; i<changeImages.arguments.length; i+=2) {
      document[changeImages.arguments[i]].src = eval(changeImages.arguments[i+1] + ".src");
    }
  }
}