function getXMLHttpRequest() {
  if (window.ActiveXObject) {
	try {
	  return new ActiveXObject("Msxml2.XMLHTTP");
	} catch(e) {
    try {
	  return new ActiveXObject("Microsoft.XMLHTTP");
	} catch(e1) {
      return null; }
    }
  } else if (window.XMLHttpRequest) {
	return new XMLHttpRequest();
  } else {
	return null;
  }
}