Problem with the rotation_center tutorial

hi everyone,
hope everyone is okay.
I’ve tried this tutorial: http://www.kirupa.com/developer/actionscript/rotation_center.htm

but nothing happens on my movie? i’ve created a movie clip, called circle which has an instance on the top layer movie called redballon with all the actionscrip in the tutorial copied into my actionscript layer on the top movie but nothing happens? can anyone shed any light on it? Many thanks,