// Function is called when we need to calculate MD5.
    function changeMenu(parentID, newPage) {
        JsHttpRequest.query(
            '/changemenu.php', // backend
            {
                'parentID': parentID, 
                'newPage': newPage
            },
            // Function is called when an answer arrives. 
            function(result, errors) {
                // Write errors to the debug div.
                // document.getElementById("debug").innerHTML = errors; 
                // Write the answer.
                if (result) {
                    document.getElementById("hole_menu").innerHTML = result["new_menu"];
                }
            },
            false  // do not disable caching
        );
    }