Session File not being deleted

Hi, I'm using: SCO Openserver 5.0.5 PHP 4.0.4 I had this problem a little while ago, and didn't find a resolution to it. I'm using sessions for a current application. The sessions are being created and used as I want them to be. I have no problems with the way they are working. The files in my /tmp directory are never being removed. I've got files in there from over 4 weeks ago and the list is growing. I reviewed all the options in the php.ini file. I changed the following two parameters to be small to see what happens: session.gc_maxlifetime = 300 ; 300 seconds = 5 minutes session.cache_expire = 2; 2 minutes No change after changing the parameters. I even stopped and started my web server to be sure that they would take effect and also printed out php_info() to make sure the correct php.ini file is being used. Any ideas as to what it might be? Thanks, Sam