http://palazzotax.com/wp-content/themes/modality%2010.2/js/scrollup.js?ver=7.1.3

1var scrollup=jQuery.noConflict();
2scrollup(document).ready(function() {
3	var offset = 220;
4	var duration = 500;
5	scrollup(window).scroll(function() {
6		if (scrollup(this).scrollTop() > offset) {
7			scrollup('.back-to-top').fadeIn(duration);
8		} else {
9			scrollup('.back-to-top').fadeOut(duration);
10		}
11	});
12				
13	scrollup('.back-to-top').click(function(event) {
14		event.preventDefault();
15		scrollup('html, body').animate({scrollTop: 0}, duration);
16		return false;
17	})
18});