Here's a nice guide with pictures to help you get the door cover off. Your problem is probably just the regulator, not the motor itself. My guess is that the binding wires finally snapped.
http://www.carstereohelp.com/s...e.htm
While you're waiting for the new regulator to arrive, I have found that pushing the window back up by hand and then clamping it up on the regulator slider (you'll understand this more when you see it) with a pair of vice grips works nicely. Way better than tape residue on the window frame.
Heath