Using two wireless networks simultaneously

I have a Linksys WRT54G and a Time Capsule, and I want to be able to use the N speed of my TC for backups without it being wired to anything (I keep it hidden in the house somewhere).
What I'd like to do is to have the iMac join two networks, one for Internet and another for TC, but try as I might, I can't get that to work. It's like I can only turn on one network or the other. I have to have TC join the LinkSys' network as a G client.
Alternatively, if the TC could be a G client and a G+N provider, that would work, too.
So can anyone think of a way to get either of these scenarios set up?

Hi tamboril,
You cannot simultaneously join more than one wireless network so your first solution won't work. You could simultaneously connect wirelessly to your Linksys and wired to your TC (or vice versa) and, so long as only one of them supplied a default gateway and they supplied IP addresses on different subnets, then that would work.
I think that you may be able to use the TC as an 'extender' but I'm not sure if that requires a wired connection between the two APs or if it can be both client and base station. If it is possible to be a repeater then you may find that you don't get much benefit from running G to the Linksys and N to the client.
Rgds,
Guy

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