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The function loadMenu() posts the page identifications to the server, which in turn returns a formated side menu with an arrow pointing to the selected page.

Source code for menu.js

function loadMenu(menu, item)
{
    // Create AJAX object
    if (window.XMLHttpRequest)
    {
        // Mozilla version
        menu_ajax = new XMLHttpRequest();
    }
    else if (window.ActiveXObject)
    {
        // IE version
        menu_ajax = new ActiveXObject("Microsoft.XMLHTTP");
    }
            
    // Prepare data to send
    var sendData = menu + ";" + item; 
    var sendData = encodeURIComponent(sendData);

    // Open session and send data
    menu_ajax.open("POST","/menu/menu.php");
    menu_ajax.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded; charset=UTF-8');
    menu_ajax.send(sendData);

    // Get data when complete at server end
    menu_ajax.onreadystatechange=function()
    {
        if (menu_ajax.readyState==4)
        {
            document.getElementById('leftLinks').innerHTML = menu_ajax.responseText;
        }
    }
}