[nikita.mmf]

var visibleListElement = null;
function ShowOrHide(obj) {
  if ( visibleListElement ) visibleListElement.style.display = 'none';
  var ul = obj.parentNode.getElementsByTagName('ul')[0];
  ul.style.display = (ul.style.display!='block')?('block'):('none');
  visibleListElement = ul.style.display=='block' && ul || null;
  return false;
}