Jquery for form with multiple save/submit buttons
One approach I used to achieved this was using the same callback function.  Then within this method, use $form_state['triggering_element']['#id'] or something similar to execute the proper function... i.e.

function my_form_submit($form, &amp;$form_state) {
  $id = $form_state['triggering_element']['#id'];

  switch ($id) {
    case 'edit-submit':
      submit_my_form($form, $form_state);
      break;
    case 'edit-save':
      save_my_form($form, $form_state);
      break;
  }
}