Pause function from main timeline

programming flash
1

Hello, I want to invoke a function from the main movie.
the function is located in a loaded swf.
I have a pause button that’s on the main timeline/swf.
How do i trigger this function from the main swf?

Here is the function:

function welcomePause():void {

Tweener.pauseTweens(welcomePopUp.welcomeText_1);
Tweener.pauseTweens(welcomePopUp.welcomeText_2);
Tweener.pauseAllTweens();

}

I tried doing it this way but it didn’t work:
within my btn click, etc.

MovieClip(this.child.child.child).welcomePause();