How do I reprogram the key/remote control for a 2000 VW Jetta VR6?

I just replaced the batteries on both my keys, because they were both out, but now i can't get them to work.How do I reprogram the key/remote control for a 2000 VW Jetta VR6?once programed it will not need to be re-programed. recheck your replacement batteries and fuses in your vehicle. may need dealer to check brain box for remote access nonfictional