Reprogramming keyless remote for '99 GMC Jimmy

I need instructions for reprogramming my keyless entry transmitters to work on my '99 GMC Jimmy - my dealer wants $40.00 per transmitter !!!! Any help is greatly appreciated.

check the Blazer forum or http://pub76.ezboard.com/fchevyblazerownersfrm7
another Jimmy/blazer forum

i have the instruction to reprogram but I charge 1.30 each send me email at lojeti@tconl.com