Hiding New products to unauthorised customers

[alexsmith2709]

Hi,
On my store i wish to hide the "new products" box from unauthorised customers. I know i can set "Customer Shop Status - View Shop and Prices" to 1 in the admin panel but that completely removes all the side boxes which i dont want to do.

I have done some searches but cant find anything that fits my needs. I saw people suggesting to use the code:

$show_categories= false;

if (!$_SESSION['customer_id']) {
  // run the code
    $show_categories= true;
} else {
// do not run the code
  $show_categories= false;
}  

if ($show_categories == true) { 

but i have no idea where i would put that. My guess would be in the whats_new.php but then i dont know where to put it in there. (i know the variable would change in this statement).

I would be grateful of any help.

Thanks