Connecting ADSL USB Modem to wireless router?

Hi,

I would like to be able to share an ADSL internet connection that is
already setup using an ADSL USB Modem (D-Link DSL-200). So I went out
and bought a d-link wireless router, took it home and opened it up to
find an ethernet cable inside which of course i couldn't connect to the
USB modem.
Thus I haven't been able to find a router that is compatible with the
one i already have and was hoping someone could point me in the right
direction?
I was thinking of just replacing the existing modem with a wireless
modem/router but the computer doesn't have an ethernet network card
either..

Any suggestions.. thanks!

.