(function(a){a.fn.scrollToTop=function(c){var d={speed:1000};c&&a.extend(d,{speed:c});return this.each(function(){var b=a(this);a(window).scroll(function(){700<a(this).scrollTop()?b.fadeIn():b.fadeOut()});b.click(function(b){b.preventDefault();a("body, html").animate({scrollTop:0},d.speed)})})}})(jQuery);