gistfile1.rb

## main file

<div id="eula_table_id">
                <%= render :partial => "config/eula_list" %>
        </div>    

          <div class="form-row">
            <%= link_to_remote "Add new end user license agreement",
                { :update => "eula_table_id", # you may not need this :update parameter
                  :before => "$('#add-user-spinner').show();" +
                             "statusInfo('wait', 'adding a new user ...');",
                  :method => :post,
                  :position => "after",
                  :url => { :controller => :config,
                            :action => :add_eula,
                            :appliance_id => current_appliance.id} }  %>
            <img src="/images/spinner.gif" id="add-user-spinner" alt="">
          </div>

## controller (config)

  def add_eula
        render :update do |page|
                page.insert_html :bottom, 'eula_table_id', :partial => "config/eula_list"
        end      
  end    


## _eula_list.html.erb
<%= text_area :image, :eula_text, :rows => 20, :value => @image.eula_text %>