Rails - Oct 2009 - A question about submitting parameters using Ajax.Updater

Hi,
How can I use Ajax.Updater to send parameters from HTML - param1 and
param2 the values of which are not in a form as such using
Ajax.Updater in a manner such that on the server side, I use the
model''s update_attributes method.

new Ajax.Updater(
			''#{options[:update_html_id]}'',
			''#{options[:update_url]}''+id,
			{asynchronous:true, evalScripts:true,
parameters:''authenticity_token='' +
encodeURIComponent(''Hl7TS7DG2dM0zmGAO09HMU8rKTNJwto37APahAPK9vA='')
}
			)

How can I modify the Updater above to generate the data below so that
I can use model.udate_attributes(params[:some_model])

{
"authenticity_token"=>"Hl7TS7DG2dM0zmGAO09HMU8rKTNJwto37APahAPK9vA=",
 "some_model"=>{"param1"=>"value1",
 "param2"=>"value2"},
 "id"=>"100"}


-- 
Regards,
Kashyap