Look at the Net tab in firebug or 'Network' tab on chrome and find all the requests going out.
Identify the request you are interested in - find out how that part is constructed ( based on the AJAX code that is present ) and make that call.
As a note some of the modules mentioned above do this for you.
In reply to Re^3: Parsing AJAX-based website
by tmharish
in thread Parsing AJAX-based website
by Anonymous Monk
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