Rails - Apr 2007 - how to obtain the selected value from collection_select

Hi,
I''m want to obtain the selected value from collection_select and to use
it
to display something from the same table or other tables.
There is my short code :

<TR>
<TD><label for="country">country
name</label></TD>
<TD><%= collection_select(:country, :country_id,
 @countries, :id, :name)  %></TD>
</TR>

by selecting a country id, my code should display the number of
population, the capital
and so one.

Do you have any idea?

Thanks

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