Action Script Button | In and Out

programming flash
1

Hello.

Hope you can help. I have a button that has a controller in order to make it interactive as the user rolls over and out. The button is actually a movie clip, containing a video that simply has a build in and out effect which is triggered by the following:

this.music_bk.onRollOver = function() {
music_bk.gotoAndPlay("_over");
}

this.music_bk.onRollOut = function() {
music_bk.gotoAndPlay("_out");
}