I don't know if its the same as on a Cherokee (XJ) but my front window regulator broke I found a fix online.http://www.lunghd.com/Tech_Articles/Body/XJ_Power_Window_Regulator_Fix.htmBit fiddly but it works well.
Hello again. As promised, my easy fix for a broken window regulator. I've just created this blog thing, so I hope it works:http://worzelsplace.blogspot.com/2010/10/how-to-fix-broken-electric-window_7292.html