Using a button on a joystick to track?

[DemonYawgmoth]

We dont want to always have the camera tracking and such, is it possible to start tracking only when a button is pressed, and then stopping when the button is pressed again? What functions would we need to call to use that, and how would we get it to use a different purpose once the button is pressed a second time? I tried doing this before for another purpose but it didnt work, so if someone could help that would be pretty super. Thanks all.