shrink tempdb

I have a sql2000 server that has a 24 /7 uptime. The tempdb size is increasing rapidly. it was 4 Gbs and i restarted the sql server to shrink the tempdb size which worked fine. but now after 1 week then tempdb size is almost 1.5gbs.

Is there anyway that i can shrink the tempDb without restarting it. Asking the users to stop using for a certain timeframe after every month or so seems like a hassle for the users.