Internet Connection Sharing through a network with a domain

[wagwa]

I am trying to share an ADSL connection through a network with a domain and a win2k server in a Pupil Referall Unit. One workstation has the adsl connection on USB which I have manually set up to be shared.
The problem is I can't run the internet sharing wizard on the other stations (because it is part of a domain) and I can't see how to set it up manually.
Any sugetstions?
Ta very much
Stuart