function newImage(arg) {
  if (document.images) {
    rslt = new Image();
    rslt.src = arg;
    return rslt;
  }
}

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

var preloadFlag = false;
function preloadImages() {
  if (document.images) {
    home_over = newImage("/nav/home-over.gif");
    bio_over = newImage("/nav/bio-over.gif");
    engage_over = newImage("/nav/engage-over.gif");
    review_over = newImage("/nav/review-over.gif");
    record_over = newImage("/nav/record-over.gif");
    news_over = newImage("/nav/news-over.gif");
    insigh_over = newImage("/nav/insigh-over.gif");
    gallery_over = newImage("/nav/gallery-over.gif");
    contact_over = newImage("/nav/contact-over.gif");
    preloadFlag = true;
  }
}