Rails - Jan 2010 - dynamic select menu doesn't work for 'form_tag'

Hi everyone,

      I have tried  with the dynamic menu using
"http://railscasts.com/episodes/88-dynamic-select-menus "  site.
i implemented and it was working fine for ''form_for'' tag.
But i need to do the same function  with ''form_tag'' as like
as,
<% javascript ''dynamic_states'' %>
<%form_tag do%>
<p>
  <label for="person_country_id">Country:</label>
  <%= collection_select :id, Country.find(:all), :id, :name, :prompt =>
"Select a Country" %>
</p>
<%end%>

child records doesn''t changed to its corresponding parent when i use
''form_tag''....
i want to do with ''form_tag''
Please help me....
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