function updatePage(req) {
    if (req.readyState == 4) {
        if (req.status == 200) {
            var response = req.responseText;
            //document.getElementById("order").value = response[0];
            //document.getElementById("address").innerHTML =
            //  response[1].replace(/\n/g, "");
            response = jQuery.trim(response);
            if (response == "true") {
                $("#logoutLink").text("Logout");
                $("#logoutLink").show();
            } else
                $("#logoutLink").hide();
        } else
            alert("Error logging out: " + request.status);
    }
}
function sendRequest(url, callback, postData) {
    var req = createXMLHTTPObject();
    if (!req) return;
    var method = (postData) ? "POST" : "GET";
    req.open(method, url, true);
    req.setRequestHeader('User-Agent', 'XMLHTTP/1.0');
    if (postData)
        req.setRequestHeader('Content-type', 'application/x-www-form-urlencoded');
    req.onreadystatechange = function() {
        if (req.readyState != 4) return;
        if (req.status != 200 && req.status != 304) {
            //			alert('HTTP error ' + req.status);
            return;
        }
        updatePage(req);
    }
    if (req.readyState == 4) return;
    req.send(postData);
    //req.send();
}

var XMLHttpFactories = [
	    function() { return new XMLHttpRequest() },
	    function() { return new ActiveXObject("Msxml2.XMLHTTP") },
	    function() { return new ActiveXObject("Msxml3.XMLHTTP") },
	    function() { return new ActiveXObject("Microsoft.XMLHTTP") }
    ];

function createXMLHTTPObject() {
    var xmlhttp = false;
    for (var i = 0; i < XMLHttpFactories.length; i++) {
        try {
            xmlhttp = XMLHttpFactories[i]();
        }
        catch (e) {
            continue;
        }
        break;
    }
    return xmlhttp;
}