Javascript IE6

var menuFile = "/fileadmin/template/php/ajaxmenu.php";
var class = "ajaxmenu";
var listFile = "/fileadmin/template/php/liste.php";
var entryFile = "/fileadmin/template/php/entry.php";
var menuDiv = "checkboxen";
var contentDiv = "mitte";


function initRequest() {
    var req = null;
    try {
        //alert("Try 1");
        req = new ActiveXObject("Microsoft.XMLHTTP");
    }
    catch(Error) {
        try {
            //alert("Try 2");
            req = new ActiveXObject("MSXML2.XMLHTTP");
        }
        catch(Error) {
            try {
                //alert("Try 3");
                req = new XMLHttpRequest();
            }
            catch(Error) {
                alert("Kein Request-Objekt gebildet");
            } 
        }
    }
    return req;
}


function showMenu() {
    if (typeof($(menuDiv).innerHTML) == "undefined")
    {
        var req = initRequest();
        req.open("get", menuFile, true);
        req.onreadystatechange = function() {
                                    if (req.readyState == 4 && req.status == 200)
                                    {
                                        $(menuDiv).innerHTML = req.responseText;
                                        new Effect.BlindDown($(menuDiv), 
                                        {duration:3});
                                    }    
                                 };
        req.send(null);
    }
}


function getChecked() {


    var ajaxmenu = document.getElementsByClassName(class);
    var checked = new Array();
    for (var i = 0; i < ajaxmenu.length; i++)
    {
        var inputs = ajaxmenu[i].getElementsByClassName("checkbox");
        for (var j in inputs)
        {
            if (inputs[j].checked)
                checked.push(inputs[j].value);
        }
    }
    return checked;
}


function showFilteredList() {
    if (arguments.length > 0)
    {
        var seite = arguments[0];
    }
    else
    {
        var seite = 1;
    }
    var checked = getChecked();
    var req = initRequest();


    req.open("get", listFile+"?ids="+checked.toString()+"&seite="+seite, "true");
    req.onreadystatechange = function() {
                                if (req.readyState == 4 && req.status == 200)
                                {
                                    $(contentDiv).innerHTML = req.responseText;
                                }
                            };
    req.send(null);

}


function showFullEntry(id) {
    var req = initRequest();
    req.open("get", entryFile+"?id="+id, "true");
    req.onreadystatechange = function() {
                                if (req.readyState == 4 && req.status == 200)
                                {
                                    $(contentDiv).innerHTML = req.responseText;
                                }
                            };
    req.send(null);
}