win2k server with two network cards to s

small home lan, using 3com isdn modem with built in dhcp and 4 port hub.
win2k server with active directory, dhcp, dns and two network cards, one connected to the 3com modem, i can connect to the internet just fine, the internal network card connected to another hub away from the 3com modem, i can connect from the client computer to the win2k server and access the share files on the server, but i cannot get to the internet.
how can i setup to connect to the internet?
the internal network card has a static address 10.10.1.1.
the server dchp is 10.0.0.0(scope)
and the internet network card is set for automatic dhcp.