Trouble accessing newly created MC

Hi everybody, this is my first post here so I’ll try to be brief

I created a MC with a simple createMovieClip, in which I load a movie. This works.

_root.createEmptyMovieClip(“pmpPlay”, 2);
loadmovie(“play.jpg”, pmpPlay);
pmpPlay._x = “20”;
pmpPlay._y = “20”;
pmpPlay._alpha = “100”;

Now when I try to access it’s onMouseDown event, nothing is triggered.

_root.pmpPlay.onMouseDown = function () {
trace(“pmpplay click”);

Any idea ? I guess it’s all about the level on the createEmptyMovie function but I’m not sure.

Thanks in advance !