Parallax.js

        var $window = $(window);
        $window.on('scroll', function () {
            var y1 = $(window).scrollTop();
            var content = $('.cus_des .foreground');
            var change = parseInt(y1 * -0.19, 10);
            content.filter(function () {
                var thisContent = $(this);
                return thisContent.offset().top < (y1 + $(window).height()) && thisContent.offset().top + thisContent.height() > y1;
            }).css({
                'background-position': 'center ' + change + 'px'
            });
        }); // Ends Scroll