Drupal - Redirect success message to shadowbox

I've got a typical webform th开发者_JAVA百科at submits using the ajax module. How can I redirect the success message to a shadowbox?

Read about lighboxing here: http://thedrupalblog.com/inserting-form-lightbox-window-and-submitting-it-ajax
I assume it's the same, just for "rel" you should use "shadowbox"

This involved a JS hook. The AJAX drupal plugin sends drupal's messages to its javascript component.