J2EE Parameter wrong SessionExpirationPeriod

Hello,

I have set the parameter "SessionExpirationPeriod"  to a wrong value with the visuall admin tool (time out value now 5 sec.). Now I can  login to the J2EE  engine not longer than 5 sec (after 5 sec i get the timeout message). This is not enough to reset  the parameter to  default. Any  idea how can I reset this parameter?

Best regards

Tom