if you have an lx, i think you can buy the optional honda opener...it's like $40 at the dealer. however, you might have to rig it up if you don't have the factory wiring and/or remote.

click here for honda instructions

get autoloc if you think you cannot get the oem piece. i think the biggest issue with aftermarket openers is the install. due to the location of the lock sometimes, it can be hard to get a good good mounting point where it will work reliably.