How to make a gnome shell extension "Click to do Alt+Tab"

Wed May 8 15:14:26 UTC 2013

Hi, I need to create (but I'm not a javascript programmer) an extension
for gnome shell that makes available a button on top bar that, when
pressed, performs the function Alt + Tab and swap the window used with
the previous one if pressed slowly and, if pressed quickly, swap all
windows in sequence. Just alt + tab do.
Can anyone help me?
Many Thanks
-- 
Dario Lesca - sip:dario at solinos.it
(Inviato dal mio Linux Fedora18+Gnome3)