[jQuery] How can i make a friendfeed like window scroll control system?

[needim]

When you active real-time updates, new entries dynamically adding a
div. At this stage scroll is automatically moving. This action
provides the content you do not miss on visible area.

If you want to see this action, you can also watch this screencast;
http://www.viddler.com/explore/itod/videos/45/

My method;

    // Firstly, i am storing the first entry's(in view) positions in
window object;
        jQuery(window).scroll(function() {
                var q = 0;
                jQuery(".entry").each(function (i) {
                     if (jQuery(this).offset().top > jQuery
(window).scrollTop()) {
                          if (q == 0) {
                               window.show_id = jQuery(this).attr
("id");
                               window.pos_y = jQuery(this).offset
().top - jQuery(window).scrollTop();
                               q = 1;
                          }
                     }
                });
        });

        // After coming to the new entry, i call this function;
        function scroll_control() {
             var scroll_top = jQuery(window).scrollTop();
             if (scroll_top != 0) {
                  if (jQuery('#'+window.show_id).length != 0) {
                       var scr = jQuery('#'+window.show_id).offset
().top - window.pos_y;
                       window.scrollTo(0, scr);
                  }
             }
        }

        // but this is due to flashing. I guess not fast enough