Евгений

$(document).ready(function() {
  var scrollTop,
    flipptext = true;
  $(window).scroll(function() {
    scrollTop = $(this).scrollTop();
    if (scrollTop > 100 && flipptext == true) {
      flipptext = false;
      $(".intro").flipping_text({
        tickerTime: 50,
        tickerCount: 5,
        customRandomChar: "!@#$%^&*"
      });
    }
  });
});