Back and forth 8 LED shift register

I finally built that circuit and It works fine.
I thank the forum members which gave me some suggestions:

http://forum.allaboutcircuits.com/showthread.php?t=41760&page=2 (in my last post you can find the right schematic)

http://forum.allaboutcircuits.com/showthread.php?t=41460 (how to invert a signal)

Video link
http://www.youtube.com/watch?v=8k-ttx2qGaA