User Levels

Is there a way to designate a user to a level that allows them to make/edit posts, make/edit pages, add/edit links…basically do everything BUT access theme manager? I know if I set them to the same level as the admin, they can do all this, but they can access the theme manager. I also tried setting their account to all the numbers below 10 (which is what my admin is set to), but they most they could do was make new posts. Help please?