function cart_item_added( qty, prodid, unitprc ) {
    alert('1');
    // You can do nice AJAXy things here, depending on your cart.
    // I have my own little car that I wrote, so I use these three
    // variables set so I can update the cart on the fly.

    // Your other option is to reload the page, that'll work too.
    top.location.reload();
}