// browser check for bg images
bName = navigator.appName;
bVer = parseInt(navigator.appVersion); 

if      (bName == "Netscape" && bVer <= 4) ver = "bad";
else ver = "good";
     
if (ver == "bad") {document.write('<style>.back1{font-face: verdana);}.back2{font-face: verdana);}</style>')}

if (ver == "good") {document.write('<style>.back1{background-image: url(images/background_01.jpg);}.back2{background-image: url(images/background_03.jpg);}</style>')}