var agt=navigator.userAgent.toLowerCase();

if ( (agt.indexOf("mozilla") != -1) && (agt.indexOf("opera") == -1) ) {

  document.write('<style type="text/css">');
  document.write('h2 { font-size: medium; }');
  document.write('#page,#message,h3,textarea { font-size: small; }');
  document.write('.validationlink,#topmenu { font-size: x-small; }');
  document.write('</style>');

}