NAME
    JSONScriptRequest - Call JSONP using script element like XMLHttpRequest

SYNOPSIS
      var req = new JSONScriptRequest();
      req.open('GET', 'http://www.example.com/jsonp');
      req.onreadystatechange = function() {
          if (req.readyState == 4) {
              alert(req.responseJSON);
          }
      };
      req.send(null);

DESCRIPTION
    See the document of XMLHttpRequest.

  Class Properties
   responseJSON
      var json = req.responseJSON;

    This attributes represents the response as a JSON object. NULL if the
    request is unsuccessful or has not yet been sent.

  Constructor
   JSONScriptRequest({...})
    The following values can be specified for the argument.

    callback_param
        The name of the callback parameter key. Default is 'callback'.

TODO
    Implement the features that is not implemented yet.
    Change throw object to an exception class from a string.

SEE ALSO
    XULPlanet
    <http://www.xulplanet.com/references/objref/XMLHttpRequest.html>

AUTHOR
    Hironori Yoshida <yoshida@cpan.org>

COPYRIGHT
      Copyright (c) 2006, Hironori Yoshida <yoshida@cpan.org>. All rights reserved.
      This module is free software; you can redistribute it and/or modify it
      under the terms of the Artistic license. Or whatever license I choose,
      which I will do instead of keeping this documentation like it is.