I just went through this myself a couple of months ago.Go to the fuse panel and look for the curcuit breaker in the top middle of the panel[metal fuse-like can].This feeds power to the door window motors.Pull off the door interior panels.You'll find the window switches.There's a big red wire that gets cut along the way,inside the door.Pull off the interior trim panel and inside the opening,you'll see the harness for the door power[it has a plug if I remember correctly].Check for continuity through the wire to the switch.I found mine was really high[500,000 ohms,HUH?].So I pulled the wire and low and behold....it was broken in the area where the wire goes through the boot to the door.I cut out the old wire and spliced in a new one.All is well.Cheaper than a hotwire kit for the door too.Hope that helps a bit.
Forgot to mention at the time this happened,my driver's door window switch for the passenger door wouldn't work the passenger's window,but the passenger's door window switch would work the passenger's side window.GNTTYPE.org has a good schematic of the door wiring controls if you need it.
I think I'll check the passenger's door window switch wiring next.It's getting kinda slow now that I've fixed the driver's door switch.Shoulda' listened to my buddies at the electronics repair shop and checked it when I was doing the driver's door.