My car remote for my 1999 Chevy Monte Carlo stopped working when I changed the battery. Why? How do I fix it?

When I changed the battery to my car my remote quit working. I was wandering how do I fix it.My car remote for my 1999 Chevy Monte Carlo stopped working when I changed the battery. Why? How do I fix it?reporgram your remote here is a web site that will tell you how to do it http://www.programyourremote.com/