Loading .swfs randomly

Another question.

My site loads a .swf into a blank movie clip when the site loads.


When a viewer loads the site again, I want a different .swf to load. Or if I hit the refresh button on the browser, I want different .swf to load. Giving it the appearance of .swfs loading randomly.

Can someone point me in the direction of a tutorial, or help me write the script for this?