function mm_cart_total() {

    if( !isset( $mosConfig_absolute_path ) ) {

        $mosConfig_absolute_path = $GLOBALS['mosConfig_absolute_path']    = JPATH_SITE;

    }

    global $mosConfig_absolute_path;

    require_once( $mosConfig_absolute_path.'/components/com_virtuemart/virtuemart_parser.php' );

    require_once(CLASSPATH.'ps_product_category.php');

    require_once(CLASSPATH. 'ps_product.php' );

    $ps_product = new ps_product;



    global $CURRENCY_DISPLAY, $sess, $VM_LANG;

    $cart = $_SESSION['cart'];

    $saved_cart = @$_SESSION['savedcart'];

    $auth = $_SESSION['auth'];

    $empty_cart = false;

    if ($cart["idx"] == 0) {

        $empty_cart = true;

        $checkout = false;

        $total = 0;

    }

    else {

        $empty_cart = false;

        $checkout = True;

        $total = $order_taxable = $order_tax = 0;

        $amount = 0;

        $weight_total = 0;



        // Determiine the cart direction and set vars

        if (@$_SESSION['vmCartDirection']) {

            $i=0;

            $up_limit = $cart["idx"] ;

        }

        else {

            $i=$cart["idx"]-1;

            $up_limit = -1;

        }

        $ci = 0;



        //Start loop through cart

        do

        {

            $price = $ps_product->get_adjusted_attribute_price($cart[$i]["product_id"],$cart[$i]["description"]);

            $price["product_price"] = $GLOBALS['CURRENCY']->convert( $price["product_price"], $price["product_currency"] );

            $amount += $cart[$i]["quantity"];

            $product_parent_id=$ps_product->get_field($cart[$i]["product_id"],"product_parent_id");

            if (@$auth["show_price_including_tax"] == 1) {

                $my_taxrate = $ps_product->get_product_taxrate($cart[$i]["product_id"] );

                $price["product_price"] *= ($my_taxrate+1);

            }

            $subtotal = round( $price["product_price"], 2 ) * $cart[$i]["quantity"];

            $total += $subtotal;

            $flypage_id = $product_parent_id;

            if($flypage_id == 0) {

                $flypage_id = $cart[$i]["product_id"];

            }

            $flypage = $ps_product->get_flypage($flypage_id);

            $category_id = vmGet( $cart[$i], 'category_id', 0 );





            if(@$_SESSION['vmCartDirection']) {

                $i++;

            }

            else {

                $i--;

            }



            $ci++;

        } while ($i != $up_limit);

        //End loop through cart

    }

    return $total;

}





echo "total: " . mm_cart_total();