function loaddata(url, element_id) {
    var element = document.getElementById(element_id);
    element.innerHTML = '<p><em>Loading ...</em></p>';
    http.open("GET", url);
    http.onreadystatechange = function() {
        if (http.readyState == 4 && http.status == 200) {
            element.innerHTML = xmlhttp.responseText;
        }
    }
    http.send(null);
}