if (document.images) {
  image1on = new Image();
  image1on.src = "images/ohome-dn.jpg";
  image2on = new Image();
  image2on.src = "images/opizza-dn.jpg";
  image3on = new Image();
  image3on.src = "images/opasta-dn.jpg";
  image4on = new Image();
  image4on.src = "images/osubs-dn.jpg";
  image5on = new Image();
  image5on.src = "images/osides-dn.jpg";
  image6on = new Image();
  image6on.src = "images/oabout-dn.jpg";
  image7on = new Image();
  image7on.src = "images/oblog-dn.jpg";

  image1off = new Image();
  image1off.src = "images/ohome-up.jpg";
  image2off = new Image();
  image2off.src = "images/opizza-up.jpg";
  image3off = new Image();
  image3off.src = "images/opasta-up.jpg";
  image4off = new Image();
  image4off.src = "images/osubs-up.jpg";
  image5off = new Image();
  image5off.src = "images/osides-up.jpg";
  image6off = new Image();
  image6off.src = "images/oabout-up.jpg";
  image7off = new Image();
  image7off.src = "images/oblog-up.jpg";


}
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");
    }
  }
}