Macintosh clients on Windows 2000

I'm trying to get Macintosh users that are connecting to our Windows 2000 server to automatically logout after idle for 60 min. Even when idle time is set for their accounts, idle time will not appear for mac clients in Computer Management, but willappear for Windows clients. There has to be a way to set this up within Windows 2000, or via a 3rd party software package.