auto update shopping cart (WPSC)

<!--IN HEADER.PHP-->

<span id="count"><?php if (function_exists('wpsc_cart_item_count')) { echo wpsc_cart_item_count(''); ?></span> items | <span id="total"><?php echo wpsc_cart_total_widget(); } ?></span>


<!--IN FUNCTIONS.PHP-->
<?
/**
* action hook for wp-e-commerce to provide our own AJAX cart updates
*/
function theme_cart_update() {
    $cart_count = wpsc_cart_item_count();
    $total = wpsc_cart_total_widget();
    echo <<<HTML
jQuery("#count").html("$cart_count");
jQuery("#total").html("$total");

HTML;
}
?>