function UpdateDiv(jlpt) {
		if (!jlpt) jlpt = 4;
    var req = new JsHttpRequest();
    req.onreadystatechange = function() {
        if (req.readyState == 4) {
            document.getElementById('ieroglif').innerHTML = req.responseJS.result;
            var d = document.getElementById(jlpt+'_tab');
            d.className = 'active';
            document.getElementById('last_update').value = jlpt;
        }
    }
    req.open(null, 'backend.php', true);
    req.send({jlpt: jlpt});
}