[web2py] ajax() infinite loop

[Marco Prosperi]

hello, I would like to update the total in the view below (bottom of the 
message) when the user changes quantity. The following script works fine 
(fixed value)

<script>
jQuery(document).ready(function(){
   $(document).ajaxStop(function(){
   jQuery('#910').slideToggle();      
   jQuery('#910').html('25.0');
   jQuery('#910').slideToggle(); 
   return false;
   });   
});
</script>

but if I replace the jQuery('#910').html('25.0');
with:

ajax("{{=URL(r=request,c='downld',f='order_reload')}}",[],'910');

where:

def order_reload():
    total=sum((qty*db.product(idx).price for idx,qty in 
session.cart.items()),0.0)
    return HTML(str(total))

then after the first increment of qty the total gets refreshed 
continuously. How can I avoid this?

thank you in advance, Marco

p.s.: here is the view

{{extend 'layout.html'}}
<h1>Checkout</h1>
<h2>Cart</h2>
<table width="100%">
  {{for id, qty in cart.items():}}{{p=db.product(id)}}
  <tr>
    <td>{{=p.name}}</td>
    <td>&euro; {{=p.price}}</td>
    <td><span class="e" id="{{='item%s'%p.id}}">{{=qty}}</span>
    
{{=A('add',callback=URL('cart_callback',vars=dict(id=p.id,action='add')),target='item%s'%p.id,_class='button
 
pill')}}{{=A('sub',callback=URL('cart_callback',vars=dict(id=p.id,action='sub')),target='item%s'%p.id,_class='button
 
pill')}}    
    </td>
  </tr>  
    {{pass}}
  <tr>
    <td>Total</td>
    <!-- <td>&euro;{{=sum((qty*db.product(id).price for id, qty in 
cart.items()),0.0)}}</td> -->
    <td><div class="one" id="910">&euro;  {{=sum((qty*db.product(id).price 
for id, qty in cart.items()),0.0)}}</div></td>
  </tr>
</table>


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