Getting Problem in giving database permission to group user

hi ,

I am getting some problem in using group in sql server login.

i have two NT groups in windows.i) developer and tester

I added a user Lalit in both gruop. I want to give db_owner permission on a particular database(Employee) to developer group and data_denyreader and deny_writer on same database(Employee) to tester group.

Now when i logging in to sql server using Lalit(windows authentication) iam not able to access the database(Employee).

Now my concern is that Lalit should have full access to the employee database when entered as developer user and limited access to employee database when entered as tester user.

how can i achieve this set up?

Please do help.

Thanks a lot in advance !!!!!!!!!!!!!!!!!!

Deny trumps any other permission (other than SA). For my testing groups, I set up SQL Server login accounts, one called "Owner" and the other called "tester". That way when the devs log in they don't have to change NT contexts.