function erzXML() {
  var resObject = null;
  try { resObject = new ActiveXObject("Microsoft.XMLHTTP"); }
  catch (Error) {
    try { resObject = new ActiveXObject("MSXML2.XMLHTTP"); }
    catch (Error) {
      try { resObject = new XMLHttpRequest(); }
      catch (Error) { alert("Erzeugung des XMLHttpRequest nicht möglich"); }
    }
  }
  return resObject;
}
function sndReq() {
  if (resObject!=null) {
    resObject.open('get','/php/rss.php',true);
    resObject.onreadystatechange = handleResponse;
    resObject.send(null);
  }
}
function handleResponse() {
  if (resObject.readyState==4) {
    document.getElementById("ajax").innerHTML=resObject.responseText;
  }
}
resObject = erzXML();
sndReq();