Airport Range Question

I have an airport graphite and a d-link di-624 and I was wondering if I could tell the airport to take any computer signal that is connected to it and re-transmit it to the d-link. The d-link is the device that is connected to the DSL modem. I could also connect the airport to the modem and have the d-link re-transmit the signal that is too far away.
Sorry that this is kinda confusing. If you need more info, just ask.

I know the feature to join a wireless network and extend the range is in the airport extreme, however i jut went into my wireless features for my apple dual ethernet router and i could not find this feature. Can the linksys expand the system? could u switch the routers?