Ruby on Rails

hi,
i would like to change a partial in my view with the change of the
item in a select_tag:

in the view:

<%= observe_field("payment_id", :url => {:controller
=>'user_admins' ,:action => 'rend_part'},:on => 'change', :frequency
=> 0.1) %>
<%= select( "payment", "id", { "Visa" => "1", "Mastercard" => "2"}) %>

in controller :

def rend_part

if params[:payment]['id'] == '1'
render :partial => "patial_one"
else
render :partial => "patial_two"

end
end

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