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("/images/button_home-over.gif");
    products_over = newImage("/images/button_products-over.gif");
    testim_over = newImage("/images/button_testim-over.gif");
    about_over = newImage("/images/button_about-over.gif");
    guarantee_over = newImage("/images/button_guarantee-over.gif");
    distrib_over = newImage("/images/button_distrib-over.gif");
    gallery_over = newImage("/images/button_gallery-over.gif");
    articles_over = newImage("/images/button_articles-over.gif");
    news_over = newImage("/images/button_news-over.gif");
    contact_over = newImage("/images/button_contact-over.gif");
    consulting_over = newImage("/images/button_consulting-over.gif");
    email_over = newImage("/images/button_email-over.gif");
    links_over = newImage("/images/button_links-over.gif");
    preloadFlag = true;
  }
}