function getXMLHTTPRequest() {
try {
req = new XMLHttpRequest();
} catch(err1) {
    try {
    req = new ActiveXObject("Msxml2.XMLHTTP");
    } catch (err2) {
        try {
        req = new ActiveXObject("Microsoft.XMLHTTP");
        } catch (err3) {
            req = false;
        }
    }
}
return req;
}