How can I join a small cluster of PCs to the main LAN wirelessly

Hello,

Can anyone explain the simplest method of achieving the following?

We have a master LAN on a 10.4.0.x.subnet which connects to the
Internet through a Zyxel Prestige wireless router. We have a small
office around 40m away with good LOS to the main office and a wireless
laptop gets a good signal. It is also on a 10.4.0.x subnet and the mask
is 255.255.255.0 in obth cases. We would like to connect the 30 PCs in
the smaller office to the main office LAN to access the main fileserver
and Internet, and I thought that this could be done wirelessly.
Obviously we could put a WLAN card in each PC but as they are already
set up on a network I wondered if I could simply connect the smaller
LAN to the bigger LAN with an access point or something like that? I've
read about bridging but the LANs are on the same subnet - they just
can't see each other. At the moment we run a length of CAT5 across the
car park on a Sunday afternoon to bring the networks together to
perform maintenance on them but this situation is not ideal. Any help
appreciated.

.

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