Database design for Role/User based access to the application..

We want to implement Role/User based access to the application.
Can anyone tell me whats the optimized way of storing the data {User, Role, Access_Type etc} in the database.. The Roles might get added in the future so i dont want to maintain a single table to map User-Access_Type..
Access_Type -->
AT_1 | AT_2 |AT_N |
------- |------- |------- -|------|
User_1 | | | |
------- |------- |--------|------ |
User_2 | | | |
------- |------ -|--------|------ |
I want to maintain a table which will map user with the Access_Type, which should be mainatained in a different table..
Any help would be highly appreciated..
Thanks in Advacnce,
Shridhar..

You find your answer here:
http://jakarta.apache.org/tomcat/tomcat-5.0-doc/realm-howto.html

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