Creating an animation that runs on each frame?

I have a basic quiz style application with which has a question and a number of choices of graphics for answers. As all these questions fade in and out they cover a number of frames for motion tweening.

What I am trying to do is when the user has selected the correct answer display “correct” and when they answer an incorrect one display “wrong”. Thsi can obviously be done by a dynamic text box but I would like it to fade in and out so I am thinking a motion tween is needed. How can I do this just once and run it in the current frame I am on without having to create the sequence over and over again.