var ShowMore = Behavior.create({
  onclick: function(evt){
    evt.stop();
    if (evt.element().down('a') || evt.findElement('a')) {
      $$('#account_balance ul li.show_more').each(function(el) {
        el.toggle();
      });
    };
  }
});

Event.addBehavior({
  'body.orders.index #account_balance ul': ShowMore,
  'body.people.show #account_balance ul': ShowMore
});