CraftCMSAjaxGet.js

function get(url, success, error) {
	var request = new XMLHttpRequest();
	request.open('GET', window.baseUrl + url, true);
	request.setRequestHeader("X-Requested-With", "XMLHttpRequest");

	request.onload = function() {
		var data = request.responseText;
		if (request.status >= 200 && request.status < 400) {
			success(data);
		} else {
			error(data);
		}
	};

	request.onerror = function () {
		error();
	};

	request.send();
}