Adding Stroke to emptymovie clips

Hey everyone,

I have a thumbnail gallery that creates an empty movie clip and puts another movie clip inside of it to load thumb nail images into. What I am trying to do is add a Stroke around the first empty movie clip to give it a thin border. The first movie clip is 75x75 and the thumbs are centered in it at 70x70.

I haven’t been able to find any info on dynamic strokes. It doesnt look like its an easy solution. anyone have any ideas or other solutions?