How do you repair your driver side door window when it has fallen off the track on a Jeep Cherokee Grand 2001?

pls see... http://www.faqfarm.com/Q/What_is_wrong_when_the_front_passenger_power_window_motor_sounds_like_it%27s_going_to_work_but_then_stops_and_the_window_will_not_move_on_a_1999_Jeep_Grand_Cherokee