Chi di voi ha mai utilizzato il seguente codice analytics x monitorare le vendite in un ecommerce?

<script type="text/javascript">

var _gaq = _gaq || [];
_gaq.push(['_setAccount', 'UA-XXXXX-X']);
_gaq.push(['_trackPageview']);
_gaq.push(['_addTrans',
'1234', // order ID - required
'Acme Clothing', // affiliation or store name
'11.99', // total - required
'1.29', // tax
'5', // shipping
'San Jose', // city
'California', // state or province
'USA' // country
]);

// add item might be called for every item in the shopping cart
// where your ecommerce engine loops through each item in the cart and
// prints out _addItem for each
_gaq.push(['_addItem',
'1234', // order ID - required
'DD44', // SKU/code - required
'T-Shirt', // product name
'Green Medium', // category or variation
'11.99', // unit price - required
'1' // quantity - required
]);
_gaq.push(['_trackTrans']); //submits transaction to the Analytics servers

(function() {
var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true;
ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js';
var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s);
})();

</script>

Dovrei sostituire i vari campi (es. ordine ID, ...) con i relativi dati. Qual'è la soluzione? Potrei fare qualcosa del genere?

_gaq.push(['_addTrans',
'RS.Fields.Item("idordine").Value', // order ID - required
oppure ...?
Grazie