ActionScript 3.0 :: Nested Button Access MovieClip On Main Timeline

I have a button inside a movieclip. When the button is clicked I want it to make a movieclip in the main timeline go to a specific frame. what's the code I need to use to define that movieclip located on the main timeline? Right now I have my code written inside the movieclip where the button is located because I have multiple buttons on multiple frames, and I don't know the syntax to define a button in a specific frame inside a movieclip.

Here's my current coding...
Code:
Select allfunction bwbtn2(btn:SimpleButton,frame:Number) {
btn.addEventListener(MouseEvent.CLICK,function() {photobw_img.gotoAndStop(frame);});
}
bwbtn2(bw19_btn,19);