you could spray some WD-40 on the switch itself and work it. or pull up on window and depress the switch at the same time.
otherwise, you're looking at dis-assembly/testing of the switch or diving into the door to check the motor and regulator components.
how to do that can be found here,
http://www.autozone.com/autozone/rep...00c152800752f7
http://www.autozone.com/autozone/rep...00c152800753ee
that's a FREE online manual for your vehicle. to nav from that page, you have to sign up and plug in vehicle info.
and you'll likely have to bounce around from topic to topic for all procedures.