new PeriodicalExecuter(roll_rss, 5);

function roll_rss()
{
  var delay = 1.6;

  var div    = $('rss');
  var first  = div.down();
  var el     = first;
  var last   = first;
  var count  = 0;

  while (el.next() != null)
  {
    count++;
    el = el.next();
  }
  last = el;
  
  var text = last.innerHTML;

  last.remove();
  var add = new Element('div');
  add.innerHTML = text;
  add.setStyle({
    margin: '-15px 0 0 0'
  });
  
  div.insertBefore(add,  div.down());
  new Effect.Morph(add, {
    style: 'margin: 0px;',
   duration: delay
  });

}