text_field_with_auto_complete undefined method error

Can anyone help me out why im getting this error:
"undefined method `text_field_with_auto_complete' for
#<ActionView::Base:0x2472460>"

I been trying to follow a tutorial here =>
http://ricardo.pacheco.name/blog/articles/2006/09/17/using-autocomplete-with-belongs_to-fields-part-ii

and cant cant anything working because of this error.

Im using Raisl 2.0.2

VIEW
<% form_tag :action => 'create' do %>
    <%= text_field_with_auto_complete('suburb', 'name', { :size =>
40 }, { :after_update_element => 'auto_complete_on_select' }) %>
    ....(more fields)....
    <%= submit_tag "Create" %>
<% end %>

CONTROLLER
  def auto_complete_for_suburb_name
    find_options = {
      :conditions => [ "LOWER(name) LIKE ?", params[:suburb]
[:name].downcase + '%' ],
      :order => "name ASC",
      :limit => 10
    }
    @suburbs = Suburb.find(:all,find_options)
    render :inline => "<%= indexed_auto_complete_result @suburbs,
'business_suburb_id', 'name', 'id' %>"
  end

any ideas?

ahh ok cool thanks for that.