internet sharing and ad hoc

ok, to discribe the problem:

i'm sharing an internet connection on a LAN card i also have a second LAN
card and a wireless adapter connected on the computer to share the connetion.
the problem is that only the computer on the LAN and the host are getting an
internet connection, the computer on the wireless connection only connects to
the network, it doesn't get the internet. the thing i don't get is that it
finds a gateway.

to further explain, the LAN connection has a hub to connect the 2 computers
while the wireless connection is a ad-hoc connection. below is a graphical
display to explain this cause i think what i said is a bit confusing.

Computer 1, ad hoc connection(netwrok, but no internet)
/
Host <--- Internet cable modem, LAN
\
Computer 2, LAN (has access to the network, internet connection)

the host has internet and access to the whole network

i tried just sharing the connection and making a bridge with the wireless
and the LAN clients.

Can any one help? any suggestions are welcomed.

Thank you in advance,
Remy