Detect MOUSE_OVER on movieclip

programming flash
1

I’m assuming this is pretty straight forward but I’m not all that great with as3 yet.

I’d like to check if my mouse is currently over a movieclip.

Here’s what I have so far:

box_mc.addEventListener(MouseEvent.MOUSE_OVER, checkBoundaries);

function checkBoundaries(evt:MouseEvent)
{
        if(this.MOUSE_OVER != false){
        trace("true");
        }else {trace("false");}
};

This actually does give me a reading of true but not a reading of false if the mouse leaves the movieclip area.

Is there a better/simpler way to do this that works?