Я хочу обнаружить прокрутку div. Этот код обнаруживает прокрутку всего окна:

$(document).ready(function() {
var track_load = 0; //total loaded record group(s)
var loading  = false; //to prevents multipal ajax loads
var total_groups = <?php echo $total_groups; ?>; //total record group(s)

$('#results').load("autoload_process.php", {'group_no':track_load}, function() {track_load++;}); //load first group

$(window).scroll(function() { //detect page scroll

    if($(window).scrollTop() + $(window).height() == $(document).height())  //user scrolled to bottom of the page?
    {

        if(track_load <= total_groups && loading==false) //there's more data to load
        {
            loading = true; //prevent further ajax loading
            $('.animation_image').show(); //show loading image

            //load data from the server using a HTTP POST request
            $.post('autoload_process.php',{'group_no': track_load},    function(data){

                $("#results").append(data); //append received data into the element

                //hide loading image
                $('.animation_image').hide(); //hide loading image once data is received

                track_load++; //loaded group increment
                loading = false; 

            }).fail(function(xhr, ajaxOptions, thrownError) { //any errors?

                alert(thrownError); //alert with HTTP error
                $('.animation_image').hide(); //hide loading image
                loading = false;

            });

        }
    }
});

});

Вот мой HTML-код.

<div id="scrollingbox">
<ol id="results">
</ol>
<div class="animation_image" style="display:none" align="center"><img src="ajax-loader.gif"></div>
</div>

Я использовал div ID, но вместо двух он ничего не выводит.