Check whether user has scrolled to the bottom of the container. From http://stackoverflow.com/questions/6271237/detecting-when-user-scrolls-to-bottom-of-div-with-jquery

scroll_bottom.js

jQuery(
  function($)
  {
    $('#flux').bind('scroll', function()
                              {
                                if($(this).scrollTop() + 
                                   $(this).innerHeight()
                                   >= $(this)[0].scrollHeight)
                                {
                                  alert('end reached');
                                }
                              })
  }
);