if (navigator.platform && (navigator.platform.indexOf('Mac')) > -1) 
  {
   //mac users
   document.write('<LINK HREF="css/mac.css" REL="styleSheet" TYPE="text/css">');
  }
 else
  {
   //windows or unix
   if (navigator.appName.indexOf('Microsoft') > -1)
    {
     //explorer
     document.write('<LINK HREF="css/win_ie.css" REL="styleSheet" TYPE="text/css">');
    }
   else
    {
     //netscape
     document.write('<LINK HREF="css/win_ns.css" REL="styleSheet" TYPE="text/css">');
    }
  }
  document.write('<LINK HREF="../css/staff.js" REL="styleSheet" TYPE ="text/css">');