Back To Top jQuery

gistfile1.js

	$(document).ready(function() {
	    var offset = 500;
	    var duration = 1000;
	    $(window).scroll(function() {
	        if ($(this).scrollTop() > offset) {
	            $('.back-to-top').fadeIn(duration);
	        } else {
	            $('.back-to-top').fadeOut(duration);
	        }
	    });

	    $('.back-to-top').click(function(event) {
	        $('html, body').animate({scrollTop: 0}, duration);
	        return false;
	        event.preventDefault();
	    })

	});