Either your power window motor has crapped out or it's just the switch contacts. You'll have to take off the interior panels to access both, so try flicking the switch back and forth and to see if it's just dirty contacts.
More info from
www.alltrac.net:
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Originally Posted by ___Scott___
There is a soft copper rocker arm inside the switch that bends over time. You just need to take the switch apart and bend it back.

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Originally Posted by Rick89GTS
After the interior door is off, unplug the wiring to the power window motor. It'll be a 2-pronged plug. Now take 2 leads from a 12V battery and run them to the two prongs (deosn't matter which side to which). The window should go up or down. If it does, you know the motor's ok and it's most likely the switch or wiring.

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Originally Posted by Rick89GTS
From my '88 BGB, enjoy

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