Rails - Oct 2011 - check_box_tag call action on change (AJAX)

Hi all,
I''m developing an application with Rails 3.0.9 and I have a checkbox
and I want to call a function when it is checked/uchecked.
I''m trying with:
<%= check_box_tag "mylabel" t.to_s, false, { :onchange =>
remote_function( :url => { :action => ''update_preview'',
:id =>
t.to_s })} %>

in the "show" view and this in the controller

  def update_preview
    puts "-> hey!!!"
  end

But the update_preview isn''t called
Someone can help me to understand?

Thanks

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