getJSONP.js

// source: https://stackoverflow.com/questions/2499567/how-to-make-a-json-call-to-a-url/2499647#2499647
function getJSONP(url, success) {
	var ud = '_' + new Date,
		script = document.createElement('script'),
		head = document.getElementsByTagName('head')[0]
				|| document.documentElement;
	
	window[ud] = function(data) {
		head.removeChild(script);
		success && success(data);
	};
	
	script.src = url.replace('callback=?', 'callback=' + ud);
	head.appendChild(script);
}