function HttpRequestDo(){var connection;if (window.XMLHttpRequest){connection = new XMLHttpRequest();if (connection.overrideMimeType){connection.overrideMimeType('text/xml; charset=utf-8');}}else if (window.ActiveXObject){try{connection = new ActiveXObject("Msxml2.XMLHTTP");}catch (e){try{connection = new ActiveXObject("Microsoft.XMLHTTP");}catch (e) {}}}if (!connection){alert('Cannot create XMLHTTP instance');return false;}return connection}var HttpRequest = HttpRequestDo()