Sure!
create a permissions field in your table. You can set different small integer values according to permission level.
When a user logs in, set a session variable equal to that value from the permissions field.
Now write a include (or function or just plain old code) at the top of each page, where you set a permission variable for that page and test it against the session permission varibale for that perticular user. If the test fails use header() to redirect them to the menu (or wherever)
This is a pretty basic method but there's lots of room for elaboration.