function item_get_discounts( sku, ctype, div )
{

var pars = 'sku=' + sku + '&custtype=' + ctype;
// use AJAX
new Ajax.Updater(div, '/cart/inc/servant.php',
  {
    method:'get',
    parameters: pars,
    onSuccess: function(transport){
      var response = transport.responseText || "no response text";
    }
    //onFailure: function(){ alert('Something went wrong...') }
  });
}