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

<% if @saved -%>
  remove_user_from_page();
  TracksPages.set_page_badge(<%= @total_users %>);
  TracksPages.page_notify('notice', '<%=  t('users.destroy_successful', :login => @deleted_user.login) %>', 5);
<% else -%>
  TracksPages.page_notify('error', '<%=  t('users.destroy_error', :login => @deleted_user.login) %>', 8);
<% end -%>

function remove_user_from_page() {
  $("#user-<%= @deleted_user.id%>").remove();
}