anchor.diff:  
      end
   
  -  if ledger != nil then footer end
  -
  -%>
  -
  -
  +  if ledger != nil then footer(diff) end
  +
  +%>
  +
  +
  
positive.code:     <td class='number'>
        <%= num_format(op.amount > 0 ? op.amount : "") %>
      </td>
      
      <td class='number'>
        <%= op.amount < 0 ? op.amount : "" %>
      </td>
  
negative.code:    ledger = nil
  
     
      diff = 0
  
     @ops.each do
       |op| 
  
       if ledger != op.ledger and ledger != nil then
         footer(diff)
       end
  
       if ledger != op.ledger then
  