if( navigator.appVersion.charAt(0) >= "3" ){
      upr = new Image(); upr.src = "Images/menu-r.gif";
      upg = new Image(); upg.src = "Images/menu-g.gif";

      overr = new Image(); overr.src = "Images/menu-r.gif";
      overg = new Image(); overg.src = "Images/menu-g.gif";
    }

    function mchg( id, fname ) {
      if( navigator.appVersion.charAt(0) >= "3" ){
        document.images[id].src = eval(fname + ".src");
      }
    }