hmmm, you say both the windows stopped working at the same time? if this is the case then its unlikely to be the motors or the switches unless its a masssssive coincidence. try testing the power to the switches with the ignition on you should be getting 12v. then try testing the power out of the switches with the ignition on and pressing the windown button.

im not sure what colour the relay is but i can try find out from my brother tomorrow he knows alot about the wiring on my car (rs1800) more then me anyway.