ActionScript 3.0 :: Determine The MouseEvent That Was Fired?

So I have a button that I have attached 2 EventListeners to. It is listening for a MOUSE_OVER and a MOUSE_OUT.

PHP Code:

ECM_button.addEventListener(MouseEvent.MOUSE_OVER, RollOverECM);ECM_button.addEventListener(MouseEvent.MOUSE_OUT, RollOverECM); 

As you can see, both events call the same function. In this function, I would like to create a new instance of a library object and then hide it, depending on the mouseEvent that fires:

PHP Code:

var ECMBox:MovieClip = new managerBox();        addChild(ECMBox); 

On the MouseOUT, I would then like to remove that from the stage as such:

PHP Code:

removeChild(ECMBox); 

I did it this way instead of firing two seperate functions because the second function has no reference to the object created in the MOUSE_OVER function and therefore cannot remove it. My question is this: Is there a way to determine in the function that is called, what mouse event called it? If I could get that, then I could set up a condition to create and object or hide the object, depending on what event was fired. Something like this:

[Code].....