// image array
  var images = new Array(
    "/images/home",
    "/images/services",
    "/images/specialties",
    "/images/promises",
    "/images/contact"
  );

  // on / selected arrays
  var ioff = new Array();
  var ion = new Array();

  for(i=0; i<images.length; i++) {

    // off images
    ioff[i] = new Image();
    ioff[i].src = images[i] + "OFF.gif";

    // on images
    ion[i] = new Image();
    ion[i].src = images[i] + "ON.gif";

  }

  function rollover(pos) {
    document["ref" + pos].src = ion[pos].src;
  }
  function rollout(pos,lock) {
	if (pos == lock) return(false);
    document["ref" + pos].src = ioff[pos].src;
  }