$qty) {
if($$isbn=="0") unset($cart[$isbn]);
else $cart[$isbn] = $$isbn;
}
$total_price = calculate_price($cart);
$items = calculate_items($cart);
}
do_html_header("Your Shopping Cart");
if($cart&&array_count_values($cart))
display_cart($cart);
else {
echo "There are no items in your cart";
echo "
";
}
$target = "index.php";
$codebase = "http://www.cs.indiana.edu/classes/a348/fall2001/bookstore/";
display_button($target, $codebase . "continue", "Continue Shopping");
$path = $PHP_SELF;
$path = str_replace("show_cart.php", "", $path);
display_button("checkout.php",
$codebase . "checkout", "Go To Checkout");
do_html_footer();
?>