var http_requestStatus = false;

  function macheRequestStatus(url) {
    alert(url);
    http_requestStatus = false;
    if (window.XMLHttpRequest) { // Mozilla, Safari,...
      http_requestStatus = new XMLHttpRequest();
      if (http_requestStatus.overrideMimeType) {
        http_requestStatus.overrideMimeType('text/xml');
      }
    } else if (window.ActiveXObject) { // IE
      try {
        http_requestStatus = new ActiveXObject("Msxml2.XMLHTTP");
      } catch (e) {
        try {
          http_requestStatus = new ActiveXObject("Microsoft.XMLHTTP");
        } catch (e) {}
      }
    }

    if (!http_requestStatus) {
      alert('Ende :( Kann keine XMLHTTP-Instanz erzeugen');
      return false;
    }
    http_requestStatus.open('GET', url, true);
    http_requestStatus.send(null);
    http_requestStatus.onreadystatechange = zeigeStatus;
  }

  function zeigeStatus(){
  alert(http_requestStatus.readyState);
    if (http_requestStatus.readyState == 4) {
    alert(http_requestStatus.status);
      if (http_requestStatus.status == 200) {
        var xmldoc = http_requestStatus.responseXML;
        
      }
    }
  }