It actually is documented ; )
http://developer.mozilla.org/en/docs/Core_JavaScript_1.5_Reference:Objects:Array:indexOf

-- kangax

On Jun 27, 10:22 am, Halil <[EMAIL PROTECTED]> wrote:
> This function accepts a second argument, to use as an offset. I have
> found this useful feature just out of trial and error :) And then
> checked it from the source as well. It's undocumented, at least in the
> official documentation. It lovely proved very useful for me like a
> surprise gift, thank you very much again, Prototype developers!
>
> Example:
>
> var ar = [1,2,3,4,5,1];
> ar.indexOf(1, 3);
> // --> 5 (the first occurrence of 1 after the position 3)
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