Listener for a movieClip

have a quick question is it possible to add a eventListener to a movie clip to listen for mouse rollover?

I have the following code:

Any ideas? Thanks

                                                                                                                                                                                                                                                                                                                        Attach Code                                                                                      
 my_mc.onRollOver = function () {
  trace ("onRollOver called");

I want something like this to take place, is there any way to make it happen? i notice that it just doesnt trigger. So i dont really know if you cant make the movie clip listen for it. Anyone know a way?

var mouseListener_obj:Object = new Object();
mouseListener_obj.onRollOver = function() {

glass_mc.addEventListener("onRollOver", mouseListener_obj);