Internet connection problem

[Liverpin]

Hi,

I am new to this group, and I am a new MCSE student. I have 3
computers on a network, one running Windows Server 2003 (which is also
a domain controller), and the other 2 just XP clients. After I joined
the 2 client-computers on the domain, they suddenly didn't have
internet anymore, only the server. Before, when they were still part
of a workgroup, everything worked fine. I'm using Adsl for my internet
connection which has a built-in 4-port switch, so all my computers are
connected to the adsl modem. The modem requires static IP addresses,
which all the pc's have. If I want to share the internet connection on
the server, it will automatically change its IP address to
192.168.0.1, which means that the server will then not have internet
access anymore, because the IP is not static anymore. Any help will be
much appreciated!!

Thank you,
Johan