if (document.images) {
  image1on = new Image();
  image1on.src = "images/nav_home_on.gif";
  image2on = new Image();
  image2on.src = "images/nav_about_on.gif";
  image3on = new Image();
  image3on.src = "images/nav_contactus_on.gif";
  image4on = new Image();
  image4on.src = "images/nav_search_on.gif";
  image5on = new Image();
  image5on.src = "images/nav_sitemap_on.gif";

  image1bon = new Image();
  image1bon.src = "images/nav_services_on.gif";
  image2bon = new Image();
  image2bon.src = "images/nav_resellers_on.gif";
  image3bon = new Image();
  image3bon.src = "images/nav_software_on.gif";
  image4bon = new Image();
  image4bon.src = "images/nav_support_on.gif";
  image5bon = new Image();
  image5bon.src = "images/nav_clientlogin_on.gif";  
  image6bon = new Image();
  image6bon.src = "images/nav_antivirus_on.gif";  
  image7bon = new Image();
  image7bon.src = "images/nav_links_on.gif";  

 
  image1off = new Image();
  image1off.src = "images/nav_home.gif";
  image2off = new Image();
  image2off.src = "images/nav_about.gif";
  image3off = new Image();
  image3off.src = "images/nav_contactus.gif";
  image4off = new Image();
  image4off.src = "images/nav_search.gif";
  image5off = new Image();
  image5off.src = "images/nav_sitemap.gif";

  image1boff = new Image();
  image1boff.src = "images/nav_services.gif";
  image2boff = new Image();
  image2boff.src = "images/nav_resellers.gif";
  image3boff = new Image();
  image3boff.src = "images/nav_software.gif";
  image4boff = new Image();
  image4boff.src = "images/nav_support.gif";
  image5boff = new Image();
  image5boff.src = "images/nav_clientlogin.gif";
  image6boff = new Image();
  image6boff.src = "images/nav_links.gif";
  image7boff = new Image();
  image7boff.src = "images/nav_links.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");
    }
  }
}