remote for 1999 GMC Jimmy

I'm looking for the right remote for my 1999 GMC Jimmy....The one I have is no good and also I need to know how to program it... If anybody knows it would be greatly appreciated.....

P.S

I tried to ON, OFF, ON, OFF thing...but that doesn't seem to work....Do I have to go to GM?:flash:

YES TAKE IT TO YOUR DEALER SOME JIMMYS HAVE TO BE CONNECTED TO THE COMPUTER. I HAVE A 97 AND 00 BOTH HAD TO BE PLUGGED IN I WORK AT A GMC DEALERSHIP. GOING RATE IS 35.00 NO MORE THAN THAT OR YOUR DEALER IS NOT FALLOWING GM POLICY.