Custom AJAX object that doesn't require jQuery.

gistfile1.txt

DD.ajax = function(settings) {
		var ajax = new XMLHttpRequest();

		// settings
		var method = settings.method || 'GET';
		var url = settings.url || null;
		var async = settings.async || true;

		ajax.open(method, url, async);
		ajax.send();

		ajax.onreadystatechange = function() {
			if(ajax.readyState === 1 && settings.beforeSend) { // opened
				settings.beforeSend();
			} else if(ajax.readyState === 2 && settings.sent) { // headers_received
				settings.sent();
			} else if(ajax.readyState === 3 && settings.loading) { // loading
				settings.loading();
			} else if(ajax.readyState === 4 && settings.success) { // done
				settings.success(ajax.responseText);
			}
		}
	}