How do you reference the main timeline of swf1 from swf2 when swf2 is loaded into swf1?

on this link          http://kb2.adobe.com/community/publishing/918/cpsid_91887.html

I found this script, but I can not use it can anyone help me

// create a variable to reference swf1's main timeline

var swf1Main_mc:MovieClip;  // this assumes that swf1 is a movieclip.

// create your listener to ensure this loaded swf has been added to the display list and can therefore obtain a

// reference to its main timeline (which is always the main timeline of the loading swf).

this.addEventListener(Event.ADDED_TO_STAGE, initF);

function initF(e:Event):void{

    swf1Main_mc = MovieClip(this.root);

}