if (typeof XMLHttpRequest == "undefined")
XMLHttpRequest = function () {
  try { return new ActiveXObject("Msxml2.XMLHTTP.6.0"); }
    catch (e) {}
  try { return new ActiveXObject("Msxml2.XMLHTTP.3.0"); }
    catch (e) {}
  try { return new ActiveXObject("Microsoft.XMLHTTP"); }
    catch (e) {}
  throw new Error("This browser does not support XMLHttpRequest.");
};

function getXMLHttpRequestObject() {
    var ref = null;
    if (window.XMLHttpRequest) {
        ref = new XMLHttpRequest();
    } else if (window.ActiveXObject) { // Older IE.
        ref = new ActiveXObject("MSXML2.XMLHTTP.3.0");
    }
    return ref;
}