if (document.images) {
  var image01on = new Image();
  image01on.src = "/images/nav/01-home-on.gif";
  var image02on = new Image();
  image02on.src = "/images/nav/02-browse-properties-on.gif";
  var image03on = new Image();
  image03on.src = "/images/nav/03-booking-requests-on.gif";
  var image04on = new Image();
  image04on.src = "/images/nav/04-site-map-on.gif";
  var image05on = new Image();
  image05on.src = "/images/nav/05-owners-on.gif";

  var image01off = new Image();
  image01off.src = "/images/nav/01-home-off.gif";
  var image02off = new Image();
  image02off.src = "/images/nav/02-browse-properties-off.gif";
  var image03off = new Image();
  image03off.src = "/images/nav/03-booking-requests-off.gif";
  var image04off = new Image();
  image04off.src = "/images/nav/04-site-map-off.gif";
  var image05off = new Image();
  image05off.src = "/images/nav/05-owners-off.gif";
}
function changeImages() {
  if (document.images) {
    for (var i = 0; i < arguments.length; i += 2) {
      document[arguments[i]].src = eval(arguments[i + 1] + '.src');
    }
  }
}