Mobile internet sharing

We have the following:
-USB mobile internet device (ZTE)
-older dLink wireless router with Ethernet connections
-Belkin USB hub
-Dell laptop (XP)
-Macbook laptop (OS X)

We want to be able to share the Internet connection without having to pass the device back and forth. We don't need to share it on-the-go, only at home.

So - is there something that can either use the dLink router to connect to the Internet via the USB mobile device OR what can I use instead of the dLink router that will accept the USB mobile Internet device and broadcast it via wifi? It will also need to attach to the Belkin hub (Ethernet) so we can also print wirelessly.

Not too technical please!

Thanks,
Romany in South America