<!--
function toggle(id) {
  if (document.getElementById("t_" + id).style.display == 'none') {
    document.getElementById("t_" + id).style.display = "";
    document.getElementById("t_" + id + "_ex").style.display = "none";
    document.getElementById("t_" + id + "_co").style.display = "";
  }
  else {
    document.getElementById("t_" + id).style.display = "none";
    document.getElementById("t_" + id + "_ex").style.display = "";
    document.getElementById("t_" + id + "_co").style.display = "none";
  }
}
// -->