Question regarding external movies

What I want to do is the following:
I have a button with an instance name of sound_btn. I’d like to load an external movie when this button is pressed, and then make this movie slide from “out of the canvas” into the canvas.

My problem is how to deal with an external movie…
this is my code, any help would be great! :beam:

import mx.transitions.Tween;
import mx.transitions.easing.*;

var revealTween:Tween;

sound_btn.onRelease=function() {
    _root.playerHolder.attachMovie("test","test.swf","playerHolder",0);
    revealTween=new Tween(test,"_x",Strong.easeInOut,300,0,2,true);
}