Movie clip visibility triggered by Mouse position

[AS3.0]

this.addEventListener(MouseEvent.MOUSE_MOVE, showLD2);

function showLD2 (e:MouseEvent):void {
        if (mouseY <= LD2nd.y+LD2nd.height/2){
        LD2nd.visible = true;
        }else 
        {
        LD2nd.visible = false;
        }
} 

do you want it to fade based on position? the above scripts makes it disappear when your mouse passes the center of the mc