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Possible Duplicate:
What does this “(function(){});”, a function inside brackets, mean in javascript?
javascript anonymous function
(function())()
this is used in many js library like jquery,YUi
It is an anonymous self executing function. It is anonymous, because it is not named, and self executing, so it runs (there would be no other way to run an un-named function).
It is particularly useful to enclose a discreet module of code, because it acts as a closure preventing variables leaking into the global namespace.