bName=navigator.appName;
if ((bName=="Netscape") && (navigator.appVersion.indexOf("Win")!=-1)) 
   { 
   document.write('<link rel="stylesheet" type="text/css" href="rsa_ns.css">');
   } 
else
   {
   document.write('<link rel="stylesheet" type="text/css" href="rsa.css">');
   }