Rails - Jun 2007 - observer_field - select form

I want to load a form when a "select form" is changed. I have done
this
but it doesn''t work( i do not have an error but nothing change when i
change the select list):

in the view:
<code><% form_tag :action => ''update'', :id =>
@cour do %>

<!-- we choose the type of document (which will determine the form to
include) -->
<p><label for="type_article">Choissisez le type de votre
article:</label><br/>
<%= select :cour, :type_article, {"cours"=>"c",
"exercice"=>"ex"},:include_blank=>true %>

<!-- we observe the select list -->
<%= observe_field ''type_article'',
          :update => "formulaire",
          :url=>{:action=>''generation_form''},
          :with=>"''type_article='' +
escape(value)",
          %>

<div id="formulaire">-</div>

<%= submit_tag ''Edit'' %>
<% end %></code>

In the controller:
<code>def generation_form
    type_article = params[:type_article]
    if type_article == "ex"
    render :partial => "formex"
    else
    render :partial => "formart"
    end
  end</code>

the partial _formex:
<code>(formualaire exo)
<p><label
for="cour_content">Contenu</label><br/>
<%= text_area ''cour'', ''content'' 
%></p></code>

thanks

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I found my mistake: wrong name of field.
=> <%= observe_field ''cour_type_article'', instead of
<%= observe_field
''type_article'',

But I still have two problems with the result:
-The form is updated when the mouse is over a type of document and would 
like to updated it when the user clic on the field.
-Without AJAX in "edit mode" the field were filled by the data already
saved. Now the fields are blank when the form is updated by AJAX.

Thanks

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