var wd=screen.width; var isNS = (navigator.appName == "Netscape"); if(wd == 800) { if(isNS) document.write(''); else document.body.background = "/img/bg-800.gif"; } if(wd == 1024) { if(isNS) document.write(''); else document.body.background = "/img/bg-1024.gif"; }