Wrap form submit buttons

Hello to all,

I'm a Drupal theme developer and long time Drupal user. Most of the time, whenever I stumble on some problem, the drupal API is there to guide me to the right direction either it's theme overriding or anything even more hardcore.

This time, I'm having so much trouble, only the community can help me.

I want to theme the node submit form buttons. It's not that simple, I know there's a theme_button() override... but what I want is to wrap those buttons in a separate div...

...

Any ideas?