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("Msxml2.XMLHTTP"); }     catch(e) {};
        try { return new ActiveXObject("Microsoft.XMLHTTP"); }  catch(e) {};

        throw new Error("This browser does not support XMLHttpRequest or XMLHTTP.");
    };