How much would it cost to put in a keyless entry system on my 98 ford escort?

I have a 1998 Ford Escort. The car has autolocks. I want to put a keyless entry on it and i was wondering if anyone knows how much is the system itself and how much would it be to have it installed.How much would it cost to put in a keyless entry system on my 98 ford escort?Depends on if you're a "do It Yourself"er.. Wal_mart sells a Kit for about $50 for Keyless entry, $80 for a Keyless entry w/ remote start. The Maker has a web page that has most of the makes and models figured out for wires and also sells harnesses for easier installs.