Active Directory and CMS integration

Hi - we use groupoffice - an opensource intranet at our office and right now it uses mysql tables only for login verification. They set it up so you could use other methods alongside with the mysql table to verify login credentials, and they even started on a rough ldap authentication module - but I can't get it to work with microsoft active directory. I need someone to finish off the programming of this feature. I'll give a bonus to anyone that finishes this job quickly and helps me get it up and running on my system.