Rich = Boolean (document.getElementById);

if (Rich) { 
  document.write("<link rel='stylesheet' type='text/css' href='global/global.css' />");
  document.write("<link rel='stylesheet' type='text/css' href='local_front.css' />");
  document.write("<link rel='stylesheet' type='text/css' href='global/svatek.css' />");
}