Rails - Jul 2007 - attachment_fu validations

I tried following an attachment_fu ajax tutorial online but am having
trouble displaying the validations. Here is the tutorial:
http://khamsouk.souvanlasy.com/2007/5/1/ajax-file-uploads-in-rails-using-attachment_fu-and-responds_to_parent

The validations work but are not displayed...
Here''s my index.rhtml page:

<h1>Photo Gallery</h1>

<div class="box">
<div class="title_bar">Photos</div>

<ul id="photos">
<% @photos.each do |photo| %>
<%= render(:partial => ''/photos/list_item'', :object
=> photo)%>
<% end %>
</ul>
<div id="column_fix"></div>
</div>

<div class="box">
<div class="title_bar">Upload</div>
<%= error_messages_for :photo %>

<% form_for(:photo, :url => formatted_photos_path(:format =>
''js''),
:html => { :multipart => true, :target =>
''upload_frame''}) do |form| %>
<%= render(:partial => ''/photos/form'', :object =>
form) %>
<% end %>
<iframe id=''upload_frame'' name="upload_frame"
style="width:1px;height:1px;border:0px"
src="about:blank"></iframe>
</div>



and the create action in my controller:

  def create
    @photo = Photo.new(params[:photo])
  @user = User.find(session[:user_id])

    respond_to do |format|
  if @user.photos << @photo

      flash[:notice] = ''Photo was successfully created.''
      format.html { redirect_to photo_url(@photo) }
      format.xml  { head :created, :location => photo_url(@photo) }
      format.js do
        responds_to_parent do
          render :update do |page|
            page.insert_html :bottom, "photos", :partial =>
''photos/list_item'', :object => @photo
            page.visual_effect :highlight, "photo_#{@photo.id}"
          end
        end
      end
    else
      format.html { render :action => "new" }
      format.xml  { render :xml => @photo.errors.to_xml }
      format.js do
        responds_to_parent do
          render :update do |page|
          end
        end
      end
    end
  end
end

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