if (document.images) 
   {
      menudir = '/images/home/';

      region1a = new Image(160,66);
      region1a.src = menudir + 'region1a.gif';
      region1b = new Image(160,66);
      region1b.src = menudir + 'region1b.gif';

      region2a = new Image(160,68);
      region2a.src = menudir + 'region2a.gif';
      region2b = new Image(160,68);
      region2b.src = menudir + 'region2b.gif';

      region3a = new Image(160,56);
      region3a.src = menudir + 'region3a.gif';
      region3b = new Image(160,56);
      region3b.src = menudir + 'region3b.gif';
   }

   function imgSwap(imgDocID,imgObjName) 
   {
      if (document.images) 
      { 
         document.images[imgDocID].src = eval(imgObjName + ".src"); 
      }
   }