Using a second WRT54GS as a repeater?

I currently have a WRT54GS working fine but the WIFI signal strength
drops a fair bit at the other end of the house. I happen to have a
second WRT54GS doing nothing so could I set this one up to act as a
WIFI repeater to get better signal strength?

If so how please?

TIA



cheers,
Len


Len Cuff