This might be a very simple question, but I can't figure out the answer.

I love the overlay module in drupal 7, but I am annoyed by the lack of visual feedback when a form is submitted in an overlay. eg. admin/structure/block, hitting submit doesn't give any indication that something is happening in the background.

I would love to know what I have to do to attach some behavior to the submit button of a form in an overlay that provides visual feedback that the form has been submitted (like greying out the overlay or something).