Rails - Dec 2006 - replace_html adding observe_field gives non-fatal error

Using this function:

    render :update do |page|
      page.replace_html ''state_options'', :partial =>
''state_options''
      page.replace_html ''city_options'', :partial =>
''city_options''
    end

on this partial:

<div id="state_options">
  <p>
    <select name="state_id" id="state_id">
    <%= options_from_collection_for_select(@states, :id, :name) %>
          <%= observe_field "state_id",
               :url     => {snip!}
               :with    => "state_id",
               :update  => "city_id" %>
     </select>
  </p>
</div>

generates an "Illegal Character" error in the Firebug java console.
However, my application still runs fine.  Without Firebug, the user
would never know.  This seems to be a result of dynamically adding a
field observer.  Is there any reason I should be concerned about this?

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