Rails - Jul 2005 - auto_complete_for error

Hi,

I''m having trouble with the new ajax features auto_complete_for and
text_field_with_auto_complete  in 13.1. I''m getting the below errors
in firefox and safari. Has anyone else run into this error? Any help
would be great.

Thanks,

Jason 

Safari Error:
TypeError - Value undefined (result of expression Ajax.Autocompleter)
is not an object. Cannot be used with new.
http://localhost:3000/contacts

FireFox Error:
Error: Ajax.Autocompleter is not a constructor
Source File: http://localhost:3000/contacts
Line: 73

controller:
class ContactsController < ApplicationController
  auto_complete_for :contact, :name

  def index
    list
    render :action => ''list''
  end

  def list
    @contact_pages, @contacts = paginate :contact, :per_page => 10
  end

end

model:
class Contact < ActiveRecord::Base
end

view:
<h1>test ajax contacts</h1>

<%= text_field_with_auto_complete :contact, :name %>

sql:
CREATE TABLE `contact` (
  `id` int(11) NOT NULL auto_increment,
  `name` varchar(40) default NULL,
  PRIMARY KEY  (`id`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1;

INSERT INTO `contact` (`id`,`name`) VALUES ("1","Jason");
INSERT INTO `contact` (`id`,`name`) VALUES ("2","Bob");