Inserire nella posizione in cui dovrà apparire lo sticky


<div class="sticky-wrapper">
    <div class="gptslot sticky" data-adunitid="15"></div>
</div>

<script type="text/javascript">
    jQuery(document).ready(function() {
        if ($('.sticky').length) { // make sure "#sticky" element exists
            var el = $('.sticky').last();
            var endItem = $('.infinite-item-end').last();
            if ($(window).width() >= 768) { // dalla larghezza dell'ipad in su
                $(window).scroll(function () { // scroll event
                    var stickyTop = el.closest(".sticky-wrapper").offset().top - 95; // returns number
                    var stickyHeight = el.height();
                    el.closest(".sticky-wrapper").height(stickyHeight);
                    var limit = endItem.offset().top;

                    var windowTop = $(window).scrollTop(); // returns number

                    if (stickyTop < windowTop) {
                        el.css({ position: 'fixed', top: 95 });
                    }
                    else {
                        el.css('position', 'static');
                    }

                    if ((limit - stickyHeight  ) < windowTop +95) {
                        var diff = limit - stickyHeight - windowTop;
                        el.css({ top: diff });
                    }
                });
            }
        }
    });
</script>

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Inserire prima di <div id="f_menu"> :

<div class="infinite-item-end" style="display:block; clear:both;"></div>