[jQuery] VALIDATE change errormessage

[fyp]

Moin,

sorry, i dont get it: how to change the error message for all fields
"This field is required".

<script type="text/javascript" src="http://dev.jquery.com/view/trunk/
plugins/validate/jquery.validate.js"></script>

  <script>
  $(document).ready(function(){
    $("#mainform").validate();
  });
  </script>


thanks,
fyp