if @virtual_class.errors.empty?
  page.insert_html :before, 'add_virtual_class', :partial=>'virtual_classes/li', :collection=>[@virtual_class]
  @virtual_class = VirtualClass.new('')
  page.replace_html 'add_virtual_class_form', :partial=>'virtual_classes/form'
  page << "$('virtual_class_name').focus();"
else
  page.replace_html 'add_virtual_class_form', :partial=>'virtual_classes/form'
end