Move Mc with mouse but when mouse Stop Mc hide

hello
i am using this on Mc

onClipEvent(enterFrame){
diffx = _root._xmouse - this._x ;
diffy = _root._ymouse - this._y ;
_x += diffx/5 ;
_y += diffy/5 ;
_alpha = 100;

}

i want when mouse stop the movie clip hide

plz help
thanks in advance