function send_order(order, url) {
  jQuery('.article-comments-list').addClass('fetching');
  jQuery.ajax({
    url:url,
    data: {"comment_order": order, "comment_page": jQuery(".pagination em").html()},
    success: function(response) {
      jQuery(".article-comments-list").html(response);
    },
    complete: function(){ jQuery('.article-comments-list').removeClass('fetching') }
  });
}

jQuery(document).ready(function(){
  jQuery("#comment_order").change(function(){
    var url = jQuery("#page_url").val();
    send_order(this.value, url);
  });

  jQuery(".pagination a").click(function(){
    url_with_param = jQuery(this).attr('href') + '&comment_order=' + jQuery("#comment_order").find(":selected").val();
    jQuery(this).attr('href', url_with_param);
  });
});