function sendTest() {
var myAjax = new Ajax.Request(
            "sendTest.php",
            {
                method: 'post', 
               // parameters: Form.serialize($('testcenter')),
                onComplete: gesendet
            }
  );
}


function gesendet(originalRequest) {
var antwort = originalRequest.responseText;
alert(originalRequest+" MELDET: "+antwort);
}