AJAX - External Domain

Use jsonp! (GET only) or use proxy

jsonp : jquery example
http://stackoverflow.com/a/3506306


References
http://en.wikipedia.org/wiki/JSONP

http://stackoverflow.com/questions/9310112/why-am-i-seeing-an-origin-is-not-allowed-by-access-control-allow-origin-error
http://stackoverflow.com/questions/3506208/jquery-ajax-cross-domain

http://api.jquery.com/jQuery.getJSON/