You'd have to edit the include/login.php
Find this code:
Code:
if(!func_is_cart_empty($cart))
func_header_location($redirect_to."/cart.php");
else
func_header_location($redirect_to."/home.php");
Change it to (substitute specials.php) for your script:
Code:
if(!func_is_cart_empty($cart))
func_header_location($redirect_to."/cart.php");
else
func_header_location($redirect_to."/specials.php");