$(document).ready(function() { 
  $('#main_stream').infinitescroll({
    navSelector  : "div.pagination",            
                   // selector for the paged navigation (it will be hidden)
    nextSelector : ".pagination a.next_page",    
                   // selector for the NEXT link (to page 2)
    itemSelector : "#main_stream",
                   // selector for all items you'll retrieve
    bufferPx: 300,
    donetext: "no more.",
    loadingText: "", 
    loadingImg: '/images/ajax-loader.gif'
  });
});