function popup(url, width, height) {
  window.open(url, 'hfdg', 'width=' + width + ',resizable=yes,scrollbars=yes,height=' + height);
}
function set_flag(id, target) {
  document.getElementById(target).src = 'images/flags/' + id + '.gif';
}
function toggle (id) {
  if(document.getElementById(id).style.display == 'none') {
    document.getElementById(id).style.display = 'block';
    document.getElementById(id + 'img').src = 'images/toggle/-.jpg';
  } else {
    document.getElementById(id).style.display = 'none';
    document.getElementById(id + 'img').src = 'images/toggle/+.jpg';
  } 
}