How to show the message after the comments submit on same page?

Hi
when user is not logged in and submit the comments without entering the text the comment_form redirect me to the wp-comments-post.php this form
and show the error message .
but what i want is comment form not be redirect and show the error message.how to do that ?
i had check the wp-includes=>comment-templates.php where i can change the form action but not proper way to do that and how to show teh custom error message on that.