Captcha place below Submit button

I installed the Captcha plug-in, and everything works fine except the captcha is placed below the Submit button, which is confusing some of my visitors.

I see there is a function that places the captcha :

add_action( ‘comment_form_after_fields’, ‘cptch_comment_form_wp3’, 1 );

For WP3. Is there a way I can modify this so it displays correctly above the submit form?