I swear you it's very easy to do. It's just a 3 keyframes cycle and offsetting the points. I hope to make some kind of tutorial soon.
the anme file (7.1) here:
http://www.mediafire.com/?e7qkl5dbbid9vdo
If you don't have AS7, you can check the rendered swf here:
http://www.swfcabin.com/swf-files/1291650007.swf
Edit:
Now, a "wish you be here" test
http://www.swfcabin.com/swf-files/1291651534.swf
