93 corolla window problem?

can anyone help me? my 93 corolla has power window. but the window keeps droping down, like something's not holding it up. the motor is fine though? anyone know wat's wrong?

If your Corrolla is anything like a 94 Camry your window is pulled up and down via a cable that runs in a track positioned in the middle of the door. In the middle of this cable is a cable clevis that is fixed in a plastic keeper. This keeper runs up and down in the track as you command it via the switch and motor and allows the window to move up and down. If the top part of this keeper is broken out, the clevis will detach itself and not pull the window up. The window will just sink down.

You will need a new window regulator assembly to fix it. You cannot change just the keeper. Should cost around $60 at any number of websites.