breadcrumbs in checkout pages


I need to modify the breadcrumbs shown in the cart/checkout pages (review cart – shipping – paymnet -confirmation -etc)

I’m using mp_show_cart(‘checkout’:wink:; on the custom mp_cart.php page. They show correct, but when I use that same function in my own functions.php as mp_show_cart_sss(‘checkout’:wink:; (so just copying it from marketpress template-functions.php) the breadcrumbs in the top disappear. I’ve search everywhere in the files for reference to these breadcrumbs but can’t find anything. How on earth are they generated and why do they disappear when I copy the mp_show_cart function to my own functions.php ?