if (document.images)
    {
      preload_navimage_object = new Image();
      // set image url
      navimage_url = new Array();
      navimage_url[0] = "images/nav/about-over.gif";
      navimage_url[1] = "images/nav/expert-over.gif";
      navimage_url[2] = "images/nav/info-over.gif";
      navimage_url[3] = "images/nav/process-over.gif";
      navimage_url[4] = "images/nav/products-over.gif";
	 navimage_url[5] = "images/nav/promise-over.gif";
	 navimage_url[6] = "images/nav/showroom-over.gif";
	 navimage_url[7] = "images/nav/specials-over.gif";

       var i = 0;
       for(i=0; i<=7; i++) 
         preload_navimage_object.src = navimage_url[i];
    }