Infinite scroll troubleshooting

Hi, I just did an infinite scroll to my test page, but it sometimes can load more, but sometimes just stucks. please help.

<script type=”text/javascript”>
var count = 2;
var total = <?php echo $wp_query->max_num_pages; ?>;
jQuery(document).ready(function(){
jQuery(window).scroll(function(){
if ( jQuery(window).scrollTop() == jQuery(document).height() – jQuery(window).height()){
if(count>total){
return false;
}
else{
loadMore(count);
}
count++;
}
});
});

function loadMore(pageNumber){
jQuery(‘a#inifiniteLoader’).show(‘fast’);
jQuery.ajax({
url: “<?php bloginfo(‘wpurl’) ?>/wp-admin/admin-ajax.php”,
type:’POST’,
data: “action=infinite_scroll&page_no=”+ pageNumber + ‘&loop_file=loop’,
success: function(html){
jQuery(‘a#inifiniteLoader’).hide(‘1000’);
jQuery(“#content”).append(html); // This will be the div where our content will be loaded
}
});
return false;
}

</script>

————————————————————————
function wp_infinitepaginate(){
if (!is_single() || !is_page()):
$loopFile = $_POST[‘loop_file’];
$paged = $_POST[‘page_no’];
$posts_per_page = get_option(‘posts_per_page’);

# Load the posts
query_posts(array(‘paged’ => $paged ));
while(have_posts()):the_post();
get_template_part( ‘content’ );
endwhile;

endif;
exit;
}