236019 cron 2

Hi, I am still in need of the following project: Challenge: I need to UPDATE $TABLE set inuse='0' if session ended, BUT not using the loggout button. For example: The user closes the browser. Let's say user logs into his/her account. login script will modify the db. (I did this already) While, a second attempt to login to the same account, then check if session in use, if not login successfully, otherwise display error message: "Session Already in use. Only one logon at a time is permitted on this system". (I did this already) If the current user clicks the LOGOUT button, then delete user row from db. (I did this already) While, a second attempt to login to the same account, then check if session in use, if not login successfully, otherwise display error message. (I did this already) I need: a) A cronjob to check every x minutes if the users session still exists If yes, do nothing If no, then UPDATE $TABLE set inuse='0'