Communicating from one MC to another both in main timeline

I can’t seem to figure out how to get buttons inside of one movieclip on my main timeline to gotoAndPlay frames in another movieclip on that same timeline.

basically I have a intro_mc that I have an enter button in.
and I would like that to gotoAndPlay a framelabel in a 2nd movieclip (content_mc)

the reasons that I have them each in their own mc and not just on the main timeline
is because I am proportionally scaling each of the mc’s to fill the browser window

I have tried to call it with parent child but I am most surely missing something

any help would be greatly appreciated.