How do I connect 2 networks???

I have two win98se systems linked by NIC's with a crossover cable (PC1 and
PC2). PC2 also has a wlan card linked to an access point/wireless
router/adsl modem.

PC2 can see PC1, access the internet, and see PC3 & PC4 (which are part of
the WLAN). But PC1 can only see PC2.

How can I link the LAN (NIC) to the WLAN (wireless card) on PC2.

thank you for your help in advance,
Simon

(pc. The reason this has come about PC1 can not use a WLAN card and is to
far from the rest of the network (and no a very long cable will not work
either :-( )