//... http_request.onreadystatechange = sendAlert; http_request.open('GET', url, true); http_request.send(null); //... function sendAlert() { if (http_request.readyState == 4) { if (http_request.status == 200) { alert(http_request.responseText); pageTracker._trackPageview("/PreOwnedVehicleSearch"); } else { alert('Error.'); } } //...