[extreme]

Not sure if anyone else had problems implementing elomibao's code, but just in case... here is what I eventually got it working as....

In cart.php, the redirect section should end up like this:

#
# Redirect
#

if($mode=="add" and $productid) {
        if($config["General"]["redirect_to_cart"]=="Y") {
		if ($mode == "added") $smarty->assign("cshopping","1");
                func_header_location("cart.php?mode=added"); 
        } else{
                if(!empty($HTTP_REFERER)) {
                func_header_location($HTTP_REFERER);
                } else {                      
						func_header_location("home.php?cat=$cat&page=$page"); 
                }
        }
}

and further down, the top line in this block needs to be added so you end up with:

if ($mode == "added") $smarty->assign("cshopping","1");
if ($mode == "checkout" || $mode == "auth") {
	$smarty->assign("checkout_step",$checkout_step);
	$smarty->assign("total_checkout_steps",$total_checkout_steps);	
}

then the tpl mods as previously posted.