// Calculate the item and grand totals 
function txtQty_onchange(rowCount, id)  {
    document.forms['ShoppingCartForm'].action = "scripts/shoppingCartUpdate.php?id=" + id + "&itemQty=" + document.getElementById("txtQty" + rowCount).value;; 
    document.forms['ShoppingCartForm'].submit(); 
} 

function item_onclick(itemId)  {
    document.forms['ShoppingCartForm'].action = "products.php?itemId=" + itemId;
    document.forms['ShoppingCartForm'].submit(); 
}