homelink transmiter

I am buying a new car with homelink..

I want to know how to build a cheep system to use one of the homelink buttons to turn a realy to constant on, then by pressing the same button turn the relay to constant off.

It is for the new corvette Z06, there is an exhause baffel that is opened when power is cut to the solinoid. so I want to control that at its fuse using the homelink garage door control.

anyone have any ideas?????

here is the product I am trying to replacate, http://www.westcoastcorvette.com/ps-1226-163-c6-z06-mild-to-wild-exhaust-control.aspx

if you read the discriprion, the remotes are not needed, just the homelink buttons on the rear view.

I think I can do it with somthing like this, http://www.aaaremotes.com/mu12vgaorgad.html just how do I get it to stay on or off at will?