Once again looking in google, and I just did not find any banner rotator in as3 for free. So, here is the as3 code for a banner rotator using xml.
It use QueueLoader , Hydrotween and Falcon. You can use images and swf. Furthermore, you can configure some parameters like the image o swf url and the buttons proporties like x,y and separation.
As all the source code here you can use it in comercial and non-commercial projects.
Art in the example by www.leonjuan.com