Rails - Jul 2008 - question about method "hidden_div_if" in AWDR 2

I followed the sample code in AWDR 2 like this:

store_helper.rb

def hidden_div_if(conditions, attributes = {})
  if conditions
    attributes["style"] = "display:none"
  else
    attr = tag_options(attributes.stringify_keys)
    "<div #{attr}>"
  end
end

store.html.erb

<%= hidden_div_if(@cart.items.empty?, :id => "cart") %>
  <%= render(:partial => "cart", :object => @cart) %>
</div>

when the cart is empty, the "<div id=... class=...>" snippet is
not
displayed there.

could anybody help me with this?
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sorry for the mistake, I didn''t read the sample code carefully.

there''s no "if..else..end" structure in this method. :)
> store_helper.rb
> 
> def hidden_div_if(conditions, attributes = {})
>   if conditions
>     attributes["style"] = "display:none"
>   else
>     attr = tag_options(attributes.stringify_keys)
>     "<div #{attr}>"
>   end
> end
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