var xmlHttp

function showMenu(menu,sub,sub2) {
    if (menu.length == 0) {
        document.getElementById("menu").innerHTML = "";
        return;
    }
    xmlHttp = GetXmlHttpObject();
    if (xmlHttp == null) {
        alert("Your browser does not support AJAX!");
        return;
    }
    var url = "menu.asp";
    url = url + "?menu=" + menu;
    url = url + "&sub=" + sub;
    url = url + "&sub2=" + sub2;
    xmlHttp.onreadystatechange = stateChanged;
    xmlHttp.open("GET", url, true);
    xmlHttp.send(null);
}

function stateChanged() {
    if (xmlHttp.readyState == 4) {
        document.getElementById("menu").innerHTML = xmlHttp.responseText;
    }
}

function GetXmlHttpObject() {
    var xmlHttp = null;
    try {
        // Firefox, Opera 8.0+, Safari
        xmlHttp = new XMLHttpRequest();
    }
    catch (e) {
        // Internet Explorer
        try {
            xmlHttp = new ActiveXObject("Msxml2.XMLHTTP");
        }
        catch (e) {
            xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
        }
    }
    return xmlHttp;
}