What wireless product needed to integrate wired/wireless??

Hi everybody. I have cable internet. It comes in from the wall, goes through the cable modem, and then into a NetGear wired router. That NetGear wired router then shares the connection with three (3) Dell Dimensions, directly into the RJ-45 port of each Dimension. (Each Dimension is within a few feet of the wired router, and all of the equipment mentioned so far is in the basement.)

Well my wife has gone and bought a laptop, and it is capable of receiving wireless internet with its onboard hardware. She wants to be able to receive a wireless broadcast upstairs in the bedroom.

I do have one free and available port on my wired router (3 of 4 outbound are used right now).

What product do I need to be able to broadcast internet to my bedroom upstairs, and still keep the three Dimensions on a wired router downstairs? (Or am I oversimplifying here?) Thank you.