https://chuvash.org/js/ajax.js

1//var request=null;
2//request=createRequest();
3
4function createRequest() {
5  var request=null;
6  try {
7  //  netscape. security. PrivilegeManager. enablePrivilege ("UniversalBrowserRead");
8    request = new XMLHttpRequest();
9  } catch (trymicrosoft) {
10    try {
11      request = new ActiveXObject("Msxml2.XMLHTTP");
12    } catch (othermicrosoft) {
13      try {
14        request=new ActiveXObject("Microsoft.XMLHTTP");
15      } catch (failed) {
16        request = null;
17      }
18    }
19  }
20
21  if (request==null) {
22    alert("Error creating request object!");
23  } else {
24    return request;
25  }
26}