function show_hide_id(id, label_id)
{ if(document.getElementById(id).style.display == "none")
  { document.getElementById(id).style.display = "block";
    document.getElementById(label_id).innerHTML = "Скрыть";
  }
  else
  { document.getElementById(id).style.display = "none";
    document.getElementById(label_id).innerHTML = "Показать";
  }
}

function view_symbols_quantity(id, quantity_viewer_id, max_symbols_quantity)
{ buf = document.getElementById(id).value;

  if(buf.length > max_symbols_quantity) buf = buf.substring(0, max_symbols_quantity);
  document.getElementById(quantity_viewer_id).innerHTML = buf.length;
}

function view_words_quantity(id, quantity_viewer_id, max_words_quantity)
{ id_value = document.getElementById(id).value;
  id_length = id_value.length;
  words_quantity = 1;
  for(counter = 0; counter < id_length; counter ++) if(id_value.charAt(counter) == "\n") words_quantity ++;

  document.getElementById(quantity_viewer_id).innerHTML = words_quantity;
  if(words_quantity > max_words_quantity) document.getElementById(quantity_viewer_id).innerHTML += "\nВнимание: Превышен лимит в " + max_words_quantity + " слов и фраз.\nПоследние " + (words_quantity - max_words_quantity) + " слов и фраз будут удалены.";
}

function erase_all(id)
{ document.getElementById(id).value = "";
}

function erase_empty_strings(id)
{ document.getElementById(id).value = document.getElementById(id).value.replace(/(\r\n)+/gm, "\r\n");
}

function set_words_quantity(id, max_words_quantity)
{ id_value = document.getElementById(id).value;
  id_length = id_value.length;
  words_quantity = 0;
  for(counter = 0; counter < id_length && words_quantity < max_words_quantity; counter ++) if(id_value.charAt(counter) == "\n") words_quantity ++;
  if(words_quantity >= max_words_quantity) document.getElementById(id).value = document.getElementById(id).value.substring(0, counter);
}