When i used the nextgen gallery version 2.0.7 the toggle menu dosentt work. The rest of my website works fine. I dont know what`s the bug, but i found many users that have the same problem.
i found the reason why the toggle menu is not function.
i changed all back to twenty eleven (function.php, styles.css, and the js data), but the toggle menu is not function.
Then i found a little code (jquery code) in my footer that f****d my toggle menu when i activated nextgen gallery. it was my own mistake and nextgen gallery has nothing todo with.
so, thanks Nextgen gallery you make a great work!!!