AJAX Upload is a free script for easily impelementing Ajaxed upload interfaces.
It comes with ready-to-use server-side code for PHP, ASP.NET & Coldfusion.
The script doesn’t require any JS library to run & compatible with any of them (the example code uses jQuery).
AJAX Upload provides access to every level of the upload process (before, after, onComplete) for a better customization.
Requirements: PHP, ASP.NET or Coldfusion
Compatibility: All Major Browsers