need a warning for destroy all

I wrote a small controller to find all the expired items and
destroy 
them:

listtodestroy=Product.find(:all, :conditions =>
['user_id = ? AND 
date_expires <= ?', user.id, Time.now])
      for product in listtodestroy
        product.destroy
      end

It works fine but there's no warning that everything is
about to be 
removed like when I call product.destroy on an id instead of
array.  Is 
there a simple way to call the "Are you sure?"
dialog for the above?

Thanks..

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