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) {      
         nav_02_over = newImage("images/nav/about_on.gif");
         nav_03_over = newImage("images/nav/services_on.gif");
         nav_04_over = newImage("images/nav/jobs_on.gif");
         nav_05_over = newImage("images/nav/clients_on.gif");
         nav_06_over = newImage("images/nav/news_on.gif");
         nav_07_over = newImage("images/nav/contact_on.gif");
         nav_08_over = newImage("images/subnav/creative_on.gif");
		 nav_09_over = newImage("images/subnav/tech_on.gif");
		 nav_10_over = newImage("images/subnav/sales_on.gif");
		 nav_11_over = newImage("images/subnav/biz_on.gif");
         preloadFlag = true;
      }
   }