code 

      <label for="keyword_selected">Select a Keyword:</label>
      <%= collection_select ('keyword', 'selected', [{:id => 0, :word => "New Keyword"},@books].flatten, :id, :word) %>

question 

I'd like to make a selection box with an extra item at the top.  Basically if they pick "New Keyword"
they fill in a text box and a new one is created.  How do I change the collection_select to add one
more item?