var height = $(document).height()-$(window).height();
            var scrolldepth = 0;
            var toTop = 0;
            $(window).scroll(function(event) {
                toTop = $(window).scrollTop();
                scrolldepth = Math.round((toTop/height)*100);
                if(scrolldepth >= scrolldepth_value && opened==0) {
                        // Do something
                }
            });