How can give the menu permission to perticular user in Joomla?

I c开发者_开发知识库reate some backend menu in joomla administrator like (Manager, admin, Super admin, agent). First three are inbuilt and agent is custom. I want to give some particular menu permission to agent. so please tell me in database which tables having menu permission to particular user. so i can set the permission. Provide me tables name in Joomla database......

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If you need a solution before 1.6 is stable, you can use any number of ACL extensions -

http://extensions.joomla.org/extensions/access-a-security/backend-a-full-access-control

JoomlaPraise also has a nice admin template that allows for menu viewing customization called AdminPraise2 that would also do what you need.