I believe observe_field is what you need (in addition to creating the
checkbox just before in your view).

http://api.rubyonrails.org/classes/ActionView/Helpers/PrototypeHelper.html#M000535

-- 
Christophe Porteneuve a.k.a. TDD
"[They] did not know it was impossible, so they did it." --Mark Twain
Email: [EMAIL PROTECTED]

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