hi everybody ...i am using a 5v relay which is used to operate a mains device which is this one
http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail?name=PB766-ND
it has 4 pins..2 for operating the relay//and to for connecting the device...i m using a small aquarium pump which operates on mains. i want to connect this pump to relay...so that it can be operated by relay...it has 2 wires, brown-live and blue-neutral, no ground wire...

can somebody help how to do this..?? its really urgent.
many thanks