<div class="col-xs-12">
<div class="text-center isolated"><a href="http://register.uxlausanne.com/" class="btn btn-lg btn-primary" id="js-buy-ticket-bottom">Buy your ticket</a></div>
</div>
var buy_ticket_bottom = document.getElementById('js-buy-ticket-bottom');
addListener(buy_ticket_bottom, 'click', function() {
ga('send', 'buy_ticket', 'button', 'click', 'above_fold');