if (document.images) {

  serviceon = new Image();
  serviceon.src = "/images/nav_service_r.gif";

  serviceoff = new Image();
  serviceoff.src = "/images/nav_service.gif";

  producton = new Image();
  producton.src = "/images/nav_product_r.gif";

  productoff = new Image();
  productoff.src = "/images/nav_product.gif";
  
  partnerson = new Image();
  partnerson.src = "/images/nav_partners_r.gif";

  partnersoff = new Image();
  partnersoff.src = "/images/nav_partners.gif";

  eventson = new Image();
  eventson.src = "/images/nav_events_r.gif";

  eventsoff = new Image();
  eventsoff.src = "/images/nav_events.gif";

  newson = new Image();
  newson.src = "/images/nav_news_r.gif";

  newsoff = new Image();
  newsoff.src = "/images/nav_news.gif";
  
  abouton = new Image();
  abouton.src = "/images/nav_about_r.gif";

  aboutoff = new Image();
  aboutoff.src = "/images/nav_about.gif";
  
  contacton = new Image();
  contacton.src = "/images/nav_contact_r.gif";

  contactoff = new Image();
  contactoff.src = "/images/nav_contact.gif";
 
  employon = new Image();
  employon.src = "/images/nav_employment_r.gif";

  employoff = new Image();
  employoff.src = "/images/nav_employment.gif";
 
  emailon = new Image();
  emailon.src = "/images/nav_email_r.gif";

  emailoff = new Image();
  emailoff.src = "/images/nav_email.gif";
  
  }

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");
    }
  }
}