This is a diagram of the front window regulator
The "blown up" section shows one of the clamps that has a rubber insert inside that holds the window in place. There should be two of them, one to the left of the slide, and one to the right (the one highlighted). I'd guess that one or both of the bolts that tighten that clamp down has worked its way loose.
You'll have to pull the door panel, and the water deflector off the door. Once that is done, and the window is rolled up all the way, through two access holes, you'll be able to see the bolts for those clamps. Tighten those down snuggly, but don't over-do. That should solve your problem.
Black 2000 SSEi, Silverstar Headlights, Angel Eyes fogs, 3rd brake light overlay, hi-flo cat, drilled 180 degree thermostat, Intense FWI, PCM, shift kit, and 3.4 Pulley. Solid front mount.