jQuery script to repeatedly scroll through a mailchimp html email

jQuery.scrollThrough.js

var pageZoom = '.9';
var pixelsPerSecond = 10;

$('#awesomewrap').hide(); // hide email header
$('html').css('zoom', pageZoom); // zoom out the page

var scrollHeight = $(document).height() - $(window).height();
var scrollThrough = function(){
  $('html, body').animate({scrollTop: 0}, 1).animate({ scrollTop: scrollHeight }, scrollHeight * 1000 / pixelsPerSecond, "linear", scrollThrough);
};
var stopScroll = function(){
  $('html, body').stop();
};
scrollThrough();