Question re: Radio security codes

["Jeff Loh" <jeff.loh@fluordaniel.com>]

     If anyone has ever worked on VW/Audi stereos with the factory 
     coded security system, they'd know my predicament.
     
     I bought my 80Q used from a dealer, but none of the papers that 
     came with the car had the code, can I successfully reprogram the

     radio or does it mean a trip to the dealer?
     
     I want to know because I plan to disconnect the battery and do 
     some simple maintenance work on the car, but don't want to screw

     up the radio in the process.
     
     I suppose the last resort would be to grovel and pay them to do
a 
     5 minute job.
     
     /J
     80Q in need of a battery cleaning.