tracks/app/views/notes/destroy.js.erb

remove_deleted_note(<%=@note.id%>);
TracksPages.set_page_badge(<%=@down_count%>);
TracksPages.page_inform("<%=  t('notes.deleted_note', :id => @note.id)%>");

function remove_deleted_note(id) {
  TracksPages.slide_up_and_remove('div#note-'+id+'-wrapper');
}