window.onscroll = function() {

 var clientHeight = document.documentElement.scrollTop === 0 ? document.body.clientHeight : document.documentElement.clientHeight;
            var scrollTop = document.documentElement.scrollTop === 0 ? document.body.scrollTop : document.documentElement.scrollTop;
            var scrollHeight = document.documentElement.scrollTop === 0 ? document.body.scrollHeight : document.documentElement.scrollHeight;

            if (clientHeight + scrollTop === scrollHeight) {
                ajaxGetNextPage();
            }
        }