I just got a book called Drupal 6 Modules and I was wondering, is the above code for disabling an sku out of date for drupal 6? maybe that is my problem. It's going to take me a while to figure out what I need to change but I can see this:
$forum_id and $form_values are replaced by $form and &$form_state. I tried replacing $form_id with these new values but neither worked...