Yes. You should be able to configure the network internally still using only one IP address from outside. There are several configurations possible. Your ISP may not provide you any help, but there is help in several websites. You should be somewhat technically inclined to do this yourself - but it seems like you are, since you are already running a small network at home. The exact steps will depend on your DSL modem and how you connect it to the computer/hub. Read a few websites before making a decision though. At worst, you may have to get another network card (2 NICs in the computer that connects to the DSL modem), but those are cheap.
(Search terms are "home network DSL" "DSL network help" and you can think up a few more.)
[This message has been edited by Narada (edited 21 November 2000).]