Partial with select changing

gistfile1.rb

<%=	form_for :asset, :url => {:controller => "import", :action => "asset_check", :format => :js }, :options =>  { :remote => true }, :html => {:method => :post, :class => "well form-horizontal"} do |f| %>
    <%= f.submit "Check File", :class => "btn" %> </br>
    <%= f.label 'Configuration', "Field Mapping:", :class => "control-label" %>
    <div class="controls">
      <%= f.select('csv_configurations', options_from_collection_for_select(@csv_configurations, "id", "name"), {:include_blank => true}, {:id => "csv_configuration", :onchange => "load_mapping(this.value)"})  %>
    </div>

    <% @csv.headers.each do |head| %>
        <%= f.label head, head.humanize, :class => "control-label", :id => "#{head}_id" %>
        <div class="controls">
          <% if @format %>
              <%= f.select head, options_for_select(@asset_attrs,@mappings.find {|map| map.csv_field_name == head}.model_field_name)  %>
              <p>Meow</p>
          <% else %>
              <%= f.select head, options_for_select(["Choose Cetani field"] + @asset_attrs, "Choose Cetani field")  %>
          <% end %>
        </div>
    <% end %>
    <%= f.hidden_field 'file', :value => @csv %>
<% end %>