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...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 chang...