function getXMLHTTP() {
  var xmlrequest = null;

  try {
    xmlrequest = new ActiveXObject("Msxml2.XMLHTTP");
  } catch(e) {
    try {
      xmlrequest = new ActiveXObject("Microsoft.XMLHTTP");
    } catch(oc) {
      xmlrequest = null;
    }
  }

  if(!xmlrequest && (typeof(XMLHttpRequest) != "undefined")) {
    xmlrequest = new XMLHttpRequest();
  }

  return xmlrequest;
}