function showAddReply() {
  var on = document.getElementById("addreply");
  on.style.display = 'block';
}

function hideAddReply() {
  var on = document.getElementById("addreply");
  on.style.display = 'none';
}

function showHeaderLogin() {
  var on = document.getElementById("header_login");
  on.style.display = 'block';
}

function logout() {
  document.getElementById("logoutForm").submit();
}