I unregister all of the variables stored in the session cookie. the strange thing is- when you log back in with another user without closing the browser, the session number is the exact same- but the variables work just fine- the user_id, for example, changes when a new person logs back in... but the session numberis the exact same! I tried turning cookies off and using the url to transfer the session id, and once they log off and log back on without cookies, the session number changes. It's definately a problem with the cookie, but I have NO idea how to change it.