[jQuery] Display message on successful client side validation.

Hello,
I'm using jquery Validation plugin (http://bassistance.de/jquery-
plugins/jquery-plugin-validation/) for client side validation.
On successful validation, I would like to display "Processing...."
message (till new page loads - non AJAX post).
Please tell how to do so ?
( If triggered via $( '#formID' ).submit(), then message is displayed
even if validation FAILS ).
Thank You.