If this IP is assigned to u by ur ISP, then u need 2 NIC in computer 1, and 1 NIC in computer2.

for windows 2000
Computer 1:
1)control panel -> Network and Dial-up Connections -> double click the NIC that connects to the Internet -> properties -> double click 'internet protocol (TCP/IP)' -> select 'obtain an IP address automatically' and 'obtain DNS server address automatically'.

2)control panel -> Network and Dial-up Connections -> double click the NIC that connects to ur LAN -> properties -> double click 'internet protocol (TCP/IP)' -> select use the following address' -> type in 192.168.0.1 for 'IP address' and 255.255.255.0 for 'subnet mask.'

computer 2:
control panel -> Network and Dial-up Connections -> double click the NIC that connects to ur LAN -> properties -> double click 'internet protocol (TCP/IP)' -> select use the following address' -> type in 192.168.0.2 for 'IP address' and 255.255.255.0 for 'subnet mask.'

This should be able to solve ur problem.

btw, if ur ISP doesn't support multiple logon then u would need to download a program and install it in the first computer to share internet connection with other computers. (I'm talking about windows 2000.)