i want same like "infinite-scroll next page" mode

[metalbug]

$(function() {

/*This first part is just throwaway code to simulate a lazy loaded page.*/

var pages = [],
ran = 5,
$pages = $('.page-set'),
i = 0,
index = 0,
loading = false;

function addPage() {
var h_page = (Math.floor((1000 - 499) * Math.random()) + 500)
$pages.append('

Page ' + (index + 1) + '

');
index++
};

for (i = 0; i < ran; i++) {
addPage(i)
}
$(window).scroll(function() {
if (loading) {
return
}
if ($(window).scrollTop() &gt; $(document).height() - $(window).height() - 200) {
loading = true;
setTimeout(function() {
addPage();
$(window).sausage('draw');
loading = false
},
250)
}
});

/*This is where the plugin is initialized.*/

$(window).sausage();
function t() {
var time = new Date();
return time.getTime()
}
var s = t();
for (var i = 0; i < 50; i++) {
$(window).sausage('draw')
}
$('#out').append((t() - s) + 'ms')
});

this one too complex
i do not understand

[metalbug]

who can help me fix this?
http://jsfiddle.net/B5sAk/24/