how to get the global position of the movieclip

Hello, I have one movieclip A within another movieclip B , and I use button to move movieclip B up and down. Then how can I get the position value of the movieclip A ( the global position not the relative position to movieclip B ).

I have the movieclip A in movieclip B with the relative position of x: -15.8 and y: -22.8

Then I have the button for moving movieclip B, say moving up with the action like

on (release) {
_root.B._y -= 5;
}

So the movieclip A is moved at the same time within movieclip B
Then how should I write the code to get the global position of movieclip A then ?
Thanks very much in advance and wait for your reply!
SBUHAsked:
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negatyveCommented:
IN the first frame of you movie write:

MovieClip.prototype.toGlobal = function(reference)
{
      var point = new Object();
      point.x = reference._x;
      point.y = reference._y;
      this.localToGlobal(point);
      return point;
}

Then, when you want to know the global position of A, write:

trace("X pos of A movieclip: " + B.A.toGlobal(_root).x)
trace("Y pos of A movieclip: " + B.A.toGlobal(_root).y)
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SBUHAuthor Commented:
Hello, thanks for your code, it works perfect. Thanks a lot !
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