Rails - May 2007 - can an hidden_field changed be detected by observe_form ?

in a view, I am changing programmatically an hidden field
''category_id''
(simulating a click)

<li>
<%= link_to_function("Baby-sitting", nil, :class =>
"enfants") do |page|
     page << "$(''category_id'').value =
''1''"
  end %>
</li>

......
<%= hidden_field_tag :category_id, @category_id -%>

I try to submit the form whenever this field (or other standard input
field...)  is changed

<%= observe_form(''prop_search_form'',
:loading => "Element.show(''search_spinner'');
Form.disable(''prop_search_form'');",
:complete => "Element.hide(''search_spinner'');
Form.enable(''prop_search_form'');",
:update => {}, :url => { :controller => ''proposal'',
:action => ''list'' })
%>

any field is correctly detected but not this hidden field... is it wrong
?
I also tried to put this value in a readonly text field... same
problem...  change event is not detected

thanks for your help

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