Accessing a printer on a second network

I have upgraded a network pc from win98 to xp pro
(Remaining all win98) and added a second network card,
this pc can now see printers on both networks but I would
like to provide access to the printers from one network
to printers on the second network. The printers are
shared and I can ping the ip of the upgraded pc with two
network cards but when I try to add a printer to any pc I
get error on port selection. Also the newtork pc's can't
see the printer connected to the upgraded pc local LPT
port!!