There is a very helpful diagnostic procedure/wiring diagram in the ford manual that id be happy to post here if you dont have it (just let me know and ill scan it in). You should be able to tell if the motor is getting power by opening or closing another window and then pressing the button for the stuck window. If the one you were opening slows down then you'll know its getting power (make sure you try the stuck one in both directions).
Hope that helps.