I have a remote for a 98 escort that doesn't work, i replaced the battery and it still doesn't work, got any ideas?

sometimes you have to hold down both lock/unlock buttons together while near the car to reset the unit. it'll be reset when the lock solenoid engages inside the door while holding down those two keys.

Check out the webpage at:

http://www.v8sho.com/SHO/Remote%20Keyless%20Entry%20TSB%2097-24-13.htm

That's where I found instructions to reprogram the remote for my 97 Escort. This page has instructions for reprogramming 97-98 Escort as well as some other Ford/Lincoln/Mercury vehicles.