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AHAH Fragment is a module which returns a specified fragment from the requested page. This allows users to create callbacks for AHAH functionality with little or no code.
When the module is enabled, any HTML fragment of a page can be extracted by simply adding a get parameter to the url describing the fragment desired. Fragments can be described using standard css selectors like 'div.node' or 'div > span.class + #someid'
The module also integrates with thickbox to provide developers and themers a way to create a callback for thickbox windows without having to write any PHP.
Instructions for use are in the README.txt