05 - Detecta scroll

<script>
window.addEventListener ?
  window.addEventListener('scroll', testScroll, false) :
  window.attachEvent('onScroll', testScroll);

var scrollCount = 0;

function testScroll() {
  ++scrollCount;
  if (scrollCount == 2) {
    dataLayer.push({ 'event': 'aceptacookies'});
  }
}
</script>