Re-initiating an autostarted session

Hi there, I have some problems with PHP session handling. I have set to .htaccess file that PHP will start sessions and use cookies only automatically. Everything works fine until I need to re-initiate the session (give a new session ID and destroy the old one). For some reason, the old session id persists. I use the following functions: session_destroy(); session_regenerate_id(); session_write_close(); Header("Location: ..."); exit; For my point of view, this should do exactly what I like to do: destroy the old session data, generate a new one, write them and redirect the user to next page. I remember somehow that there have been problems with SetCookie and Header("Location: ..") combination. Could this session problem arise due same reasons? Well, I'm happy to hear the fixes or workarounds. =) Thanks, Ville