function year_filter() {
   if (document.getElementById('filter_response') != null) {
      document.getElementById('filter_response').innerHTML = "<img src='include/roll.gif'>Caricamento...";
   }
   if (document.getElementById('sel_year') != null) {
      var sel_year = encodeURI(document.getElementById('sel_year').value);
   } else {
      var sel_year = 'default_value';
   }
   http2.open('get', 'script/info_frm.php?sel_year=' + sel_year);
   http2.onreadystatechange = show_filtered;
   http2.send(null);
}

function show_filtered() {
   if (http2.readyState == 4){
      var response = http2.responseText;
      document.getElementById('box_notizie_content').innerHTML = response;
   }
}

function init() {
   var id_box_notizie_content = document.getElementById('box_notizie_content');

   if (id_box_notizie_content != null) {
      year_filter();
   }
}

var http2 = createXmlHttpRequestObject();
window.onload = init();