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Calling an action when a selection box changes

in partial (view)

<%= select('history', 'sel', history_list, {:selected => selected}, {:class => 'historyselect'}) %>
<%= link_to_remote 'x',
      :url => {:controller => 'rriki',
               :action => 'clear_history'},
      :html => {:title => 'Clear history'},
      :method => :get %>
<%= observe_field 'history_sel',
    :url => {:controller => 'rriki',
             :action => 'select_item_in_history'},
    :with => 'history_sel' %>

changing the select will call the action select_item_in_history with params['history_sel'] set to the selected value.
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