Using JSON web services in jQuery - simple example

Lets web-service returns this data:

{"user":{"@id":"10","firstName":"Bill","lastName":"Clinton"}}

Here is the JavaScript code:
                var ws_url = 'http://example.webservice.com:8002/xxx-ws/management/usr/10';
                $.ajax({
                  url: ws_url,
                  dataType: 'json',
                  timeout : 5000,
                }).success(function( data, textStatus, xhr ) {
                        alert( "returned user name = " + data.user.firstName + " " + data.user.lastName );
                        gdata = data;
                }).error(function(httpObj, textStatus) {       
                    alert(textStatus);
                    alert(JSON.stringify(httpObj));
                });


You will get [returned user name = Bill Clinton]