first, is it possible at all?

Computers and their OS:
XP pro Desktop
Server 2003 desktop hardwired to router (dlink 614+[used as a file sharing box])
server 2000 laptop wirelessly connected (trendware card)

what i want:
the XP desktop to connect to the laptop and use the wireless connection of the laptop to get on the internet and see the 2003 desktop

i have the XP desktop connected to the laptop via crossover cat cable....i dunno how to do the rest, i get errors trying to share the connection....havent had much experience with 2000