Group membership and OU are very different. Users can be tested for group membership with InGroup() but computers cannot. There are several UDFs posted that let you test on OU.
http://www.kixtart.org/cgi-bin/ultimatebb.cgi?ubb=get_topic;f=12;t=000179
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Give a man a fish and he will be back for more. Slap him with a fish and he will go away forever.
