> 2)  i´m looking through this http://valums.com/ajax-upload/  right
> now ... trying to understand how it works... and i guess its not using
> xhr but there certainly seems to be a work around out there

It uses IFRAME as chone already suggested.

An  ideal  class  would  use  PE  to  detect  when HTML 5 File API and
attendant features can be used instead. It wouldn't make much sense to
build a class today that can't adapt to true AJAX if available.

See:

http://dev.w3.org/2006/webapi/FileAPI/
https://developer.mozilla.org/en/using_files_from_web_applications
etc.

-- Sandy

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