var br = "IE";
var ua = navigator.userAgent.toLowerCase();
if(navigator.appName == "Netscape") br = "NS"; 
if(ua.indexOf("safari") != -1) br = "SF"; 
if(ua.indexOf("firefox") != -1) br = "SF";
document.writeln('<link rel=StyleSheet href="ss/bac'+br+'.css" title="BAC">');