On press go to a fram in this* MC

I have a button.
I have a MC, with a image.
in the MC I have 2 frames, frame 1 is empty and frame 2 is a big image.

I want when I press the button, the MC will go to frame 2 where the image shows up. but I cannot

on(release) {
_root.MyMovieClip.gotoAndStop(2)
}

–I get a error from flash.

-thank you :A+: