I have a WRT54G version 3 with an SES button that I would like to re-program. I have Shibby Tomato version tomato-ND-1.28.5x-112-VPN installed. I selected the option to change the function of the button to "shutdown" but it does not work. What am I doing wrong? Do I need to specifically write the script, and if so, what should it be.