WordPress MU

My coder is setting up my website using the WPMU platform. I've been extremely specific with him from the start and have explained to him that users may only be permitted to post to certain categories (7 in all). There are now about 12 categories and the user backend shows all 12 categories available for posting to a user.

How do I display only the 7 categories that I want users to post to in the Category box?

Thank you all for your time and attention.

Take advantage of following...

http://www.mediafrenzy.co.za/2009/06/category-restriction-for-wordpress/

Smbishop - did you ever get this resolved? I would like to have the same control. The link above is great for reading, but I need something to allow categories for the writer.

Thanks!