// AJAX File

function createXMLHTTP() {
    var ajax;

    try {
        ajax = new ActiveXObject("Microsoft.XMLHTTP");
    } catch(e) {
        try {
            ajax = new ActiveXObject("Msxml2.XMLHTTP");
            alert(ajax);
        } catch(ex) {
            try {
                ajax = new XMLHttpRequest();
            } catch(exc) {
                alert("This browser does not support Ajax");
                ajax = null;
            }
        }
        return ajax;
    }

    var arrSignatures = ["MSXML2.XMLHTTP.5.0", "MSXML2.XMLHTTP.4.0",
    "MSXML2.XMLHTTP.3.0", "MSXML2.XMLHTTP",
    "Microsoft.XMLHTTP"];

    for (var i=0; i < arrSignatures.length; i++) {
        try {
            var oRequest = new ActiveXObject(arrSignatures[i]);
            return oRequest;
        } catch (oError) {
        }
    }

    throw new Error("MSXML is not installed on your system.");
}