$(window).addEvent('domready', function() {
  if ($$('a.register').length > 0) {
    $$('a.register').addEvent('click', function() {
      $$('form.login')[0].addClass('hidden');
      $$('form.register')[0].removeClass('hidden');
      $$('form.recover')[0].addClass('hidden');
      return false;
    });
    $$('a.login').addEvent('click', function() {
      $$('form.login')[0].removeClass('hidden');
      $$('form.register')[0].addClass('hidden');
      $$('form.recover')[0].addClass('hidden');
      return false;
    });
    $$('a.recover').addEvent('click', function() {
      $$('form.login')[0].addClass('hidden');
      $$('form.register')[0].addClass('hidden');
      $$('form.recover')[0].removeClass('hidden');
      return false;
    });
  }
});