Form wont submit in Firefox, works in IE

Form wont submit in Firefox, works in IE

A simple online registration form, using php validation and jQuery 1.3.2.
It works perfectly in IE, but not in firefox. when you click the submit button absolutely nothing happens.
Please help. Thank you in advance
  1. <script type="text/javascript" src="js/jquery.js"></script>
  2. <script type="text/javascript">
  3. // <![CDATA[
  4. jQuery(document).ready(function(){
  5.     $('#registrationform').submit(function(){                 
  6.         var action = $(this).attr('action');
  7.         $.post(action, {
  8.             organizationname: $('#name').val(),
  9.             program: $('#program').val(),
  10.             registrant: $('#registrant').val(),
  11.             email: $('#email').val(),
  12.             phone: $('#phone').val(),
  13.             address: $('#address').val(),
  14.             address2: $('#address2').val(),
  15.             message: $('#message').val()
  16.         },
  17.             function(data){
  18.                 $('#registrationform #submit').attr('disabled','');
  19.                 $('.response').remove();
  20.                 $('#registrationform').before('<p class="response">'+data+'</p>');
  21.                 $('.response').slideDown();
  22.                 if(data=='Registration Submitted!') $('#registrationform').slideUp();
  23.             }
  24.         );
  25.         return false;
  26.     });
  27. });
  28. // ]]>
  29. </script>