@session_start generates a new session_id

Hi, I made an update to Apache/1.3.31 (Unix) PHP/4.3.9 and before this everythings works fine. The problem is that a following page generates a new session stored under the session.save_path and the stored variable e.g. $_SESSION['SESS_CUS'] is not valid anymore due the SID entry. On both pages I use this to start: @session_start(); session_name("userauth"); $_SESSION['SESS_CUS'] = $user_id; to verify the $USER_ID in conjunction with the actual valid session value. I tried already a form with a hidden field to overgive the session which works fine in the former version: <form method=post action=\"./MyFILE.php?USERNAME=$realname&USER_ID=$user_id\"> <INPUT TYPE=\"hidden\" NAME=\"session_name();\" value=\"session_id();\"> <INPUT TYPE=\"submit\" VALUE=\"Login for the board\"> </form> But this doesn't work anymore ... The new LAMP system generates everytime after calling @session_start(); a new session. Either on the same page or a following one. How can I prevent this behavior by using the PHP session management function ? -- Best Regards, Mark