// scroll to content button
var $scrollToContentBtn = $('.js-scroll-to-content'),
    allowScrolling = true;

allowAutoScrolling = $(window).scrollTop() === 0;

$(window).scroll(function () {
    var $this = $(this);

    if ($this.scrollTop() > 0 && allowAutoScrolling) {
        $('html, body').animate({
            scrollTop: $this.height()
        }, 'slow');
    }

    allowAutoScrolling = $this.scrollTop() === 0;
});