Win2K server and printers.

I do hope that someone is able to help me.
System = Win2k server, Win2k workstations, 1 domain, 3 rooms each with a 2 port print server each with a laser and an inkjet connected to the print servers (netgear) all work fine. The problem is that we are a large sm school and have aprox 1000 users roaming between all 3 rooms. How can I set up the printers to only print to the printerd in the room they inhabit regadless of who logs on. ie. if a user logs on in room 18 he can only print to the printers in 18. And the same in the other rooms. Sorry this is so long.

If you can help I will be your slave for ever, well for a time anyway.

Peter