var nav;
 var os;
 var result;

 if (navigator.appName.indexOf('Netscape') != -1)
  nav = 'ns';
   else if (navigator.appName.indexOf('Microsoft') != -1)
    nav = 'ie';
     else nav = 'no';
  
 if (navigator.appVersion.indexOf('Win') != -1)
   os = 'win';
    else if (navigator.appVersion.indexOf('Mac') != -1)
     os = 'mac';
      else nav = 'no';

 result = os + nav;
 if (result.indexOf('no') != -1) result = 'nono';
//alert("<LINK REL=stylesheet HREF=\"" + result + ".css\" TYPE=\"text/css\">");

 document.write("<LINK REL=stylesheet HREF=\"" + result + ".css\" TYPE=\"text/css\">");