window.addEvent('domready', function() {

  var myFx = new Fx.Tween($('race_description'));

	var req = new Request.HTML({
		onSuccess: function(html) {
			$('race_description').
        adopt(html);
			$('race_description').
        fade('in');
		},
    onRequest: function() {
			$('race_description').
        set('text', '').
        fade('out');
    },
		onFailure: function() {
			$('race_description').set('text', '');
      alert('Ajax requests don\'t seem to be supported on your browser.'+
        '\nPlease advise the administrators.');
		}
	});

  $('registration_ant_race_id').addEvent('change', function() {
    req.send({
      url:'/registration/showrace/race_id/' + this.get('value'),
      method:'get',
      evalResponse:true, evalScripts:true
    })
	});
});