function comment_show (id_comment) {
  var comment_select = document.getElementById ("comment_id_" + id_comment);
  
  if (comment_select) {
    if (comment_select.style.display == 'table-row') {
      comment_select.style.display = 'none';
    } else {
      comment_select.style.display = 'table-row';
    }
  }
}