How to do a AJAX JSONP (Cross Site Domain request)

PHP file

<?php

				header("Expires: Mon, 26 Jul 1997 05:00:00 GMT" );
				header("Last-Modified: " . gmdate( "D, d M Y H:i:s" ) . "GMT" );
				header("Cache-Control: no-cache, must-revalidate" );
				header("Pragma: no-cache" );
				header("Content-type: application/json");

    if(isset($_GET['name']) && isset($_GET['callback']))

    {

        $obj->name = $_GET['name'];

        $obj->message = "Hello " . $obj->name;

        echo $_GET['callback']. '(' . json_encode($obj) . ');';

    }

?>

Javascript :

        $("#useJSONP").click(function(){

            $.ajax({

                url: 'http://domain.com/jsonp-demo.php',

                data: {name: 'xerxis'},

                dataType: 'jsonp',

                jsonp: 'callback',

                jsonpCallback: 'jsonpCallback',

                success: function(){

                    alert("success");

                }

            });

        });

    });

    function jsonpCallback(data){

        $('#jsonpResult').text(data.message);

         }

Ref: http://www.giantflyingsaucer.com/blog/?p=2682    

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