Assigning _root variable from dynamic MC

programming flash
1

Setup
I have mc that dynamically loads in a mc onto the stage. On the last frame of the dynamic mc it tells the main timeline to advance 2 frames which then load in the next mc.

Issue
Once all the mc’s play and the _root movie goes back to the first frame it still continues to loop.

Question
How do I assign a value to a var that lives on the main timeline from a dynamic mc that can also be read fromm the dynamic mc?

Here is my code:

 stop();
///////////////////////////////////////
/////    Variable
///////////////////////////////////////
var vid1;
trace(vid1)
vNav.gotoAndStop(1);
loadMovie("media/vid1.swf", "vHolder");

here is the code from last frame of the Dynamically loaded MC:

 stop();
// -----
if (_root.vid1 == undefined){
_root.gotoAndPlay(3);
_root.vid1 = played;
} else if(_root.vid1 == played){
	trace ("FOO")
}