session destroy???

Hello all, when using sessions, if use command session_destroy shouldn't all variables related with used session destroyed??? It seams that is a crazy question, but, after make a logout(session_destroy()), I use the browser buttons to go back to inicial page and forward until logout page, it continues appers sessions data, it's bad because someone can enter in my browser after me and make fully things in my page.... How can I solve this problem? I already try to use OnLoad and UnOnload events in Javascript.... T.Y all Best Regards Miguel Loureiro < m.loureiro@distrim2.pt >