anchor.diff:          <%= form_tag do %> 
           <%= hidden_field_tag(:price, item.id)   %>
           <input type="submit" style="display:none"/>
  -        <%= text_field_tag "price#{item.id}" , item.price , 
  +        <%= text_field_tag "price#{item.id}" , item.price ,
           :onclick => "this.form.price#{item.id}.select()" , 
           :onfocus => "this.form.m#{item.id}.select()"  , :size => 8  %>
           <% end %>
  
positive.code:       <big>  
          <%= form_tag do %>
          <%= hidden_field_tag(:item, item.id) %>
          <%= select_tag("discount" , options_for_select( ["",0,5,10,15,20,25,30,35,40,50,60,70] , item.price), :onchange => 'this.form.submit()')%> 
          <%end%>
        </big> 
      </td>
  
negative.code: 
    <tr class="total">
      <td colspan="3"><b><%= t('order_total') %>:</b></td>
      <td colspan="2" class="total"><span id="order_total"><%= @order.display_total.to_html %></span></td>
    </tr>
  </table>
  <br/>
  