This is easy to do mate!
Put XP CD in one machine with the ADSL connection, Installed Network Service for home use, Set it to allow computers to access the internet though this. Secondly put the XP CD in the other machine (Any winOS after 95 should be able to use this utilty) and install a HomeNetworking Gateway, Select to connect to internet through other computer on LAN, Restart, Job's a'gooden!
Connect to the internet on primary PC with ADSL and the gateway should let anyone else on the LAN setup to access the internet though the ADSL comp (Thats what I got)
Internet
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ADSL on XP + Service with Network Card
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HUB (LAN)- - - 98 + Gateway with Network Card
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ME + Gateway with Network Card