activate = function(element)
{
  var li = element.parentNode.parentNode;
  li.className = 'active';
  var content_container = li.parentNode.parentNode.parentNode;
  var lists = content_container.getElementsByTagName('ul');
  for (var i = 0; i < lists.length; i++)
  {
    if (lists[i] != li)
    {
      var elements = lists[i].getElementsByTagName('li');
      for (var j = 0; j < elements.length; j++)
      {
        if (elements[j] != li)
        {
          elements[j].className = '';
        }
      }
    }
  }
}

deactivate = function(element)
{
  var li = element.parentNode.parentNode;
  li.className = '';
}

send_url = function(url)
{
  new mPopup('/image_popup.php?image=' + url, {
                    'dependent':  'yes',
                    'height':     '620',
                    'width':      '820'
                  }).open();
}