Tiny XMLHTTPRequest shim

xmlhttprequest.js

var ids = ["Msxml2.XMLHTTP", "Microsoft.XMLHTTP", "Msxml2.XMLHTTP.4.0"];
if (typeof XMLHttpRequest === "undefined") {
  for (var i = 0; i < ids.length; i++) {
    try {
      new ActiveXObject(ids[i]);
      window.XMLHttpRequest = function() {
        return new ActiveXObject(ids[i]);
      };
      break;
    } catch (e) {}
  }
}