[devote]

function collapsElement(id, self) {
  var el = document.getElementById(id);
  if ( el.style.display != "none" ) {
    el.style.display = 'none';
    self.style.backgroundPosition = '0 -14px';
  } else {
    el.style.display = '';
    self.style.backgroundPosition = '0 0';
  }
  return false;
}

<td><a class="movie_openers" href="" onclick="return collapsElement('identifikator', this)" title="" rel="nofollow">Описание</a></td>