var userAgent = navigator.userAgent.toLowerCase();
var browser = {
version: (userAgent.match( /.+(?:rv|it|ra|ie)[\/: ]([\d.]+)/ ) || [])[1],
safari: /webkit/.test( userAgent ),
opera: /opera/.test( userAgent ),
msie: /msie/.test( userAgent ) && !/opera/.test( userAgent ),
mozilla: /mozilla/.test( userAgent ) && !/(compatible|webkit)/.test( userAgent )
};

if (browser.msie) 
{
       document.write("<link REL='stylesheet' HREF='css/foyer.css' TYPE='text/css'>");
}
else 
{ 
  if (browser.mozilla)
  {
       document.write("<link REL='stylesheet' HREF='css/foyerFF.css' TYPE='text/css'>");
  }
  else
  {
   if (browser.opera)
   {
       document.write("<link REL='stylesheet' HREF='css/foyerOP.css' TYPE='text/css'>");
   }
   else
   {   
      if (browser.safari)
       {
           document.write("<link REL='stylesheet' HREF='css/foyerSF.css' TYPE='text/css'>");
       }
       else
       {
          document.write("<link REL='stylesheet' HREF='css/foyerUN.css' TYPE='text/css'>");
       }
   }
  }
}