How to disable screensaver on 6670?

Hi all, does anybody know how to turn off screen saver on nokia 6670?
on nokia 6680 we can achieve this by setting phone/standby mode
but on 6670, this feature is not exist, except to make the screen saver time out longer (up to 30 mins)

I know there's a way : user::inActivity.....
but I may not use the light feature to achieve this....so.....I'm totally blank

I really need your help on this...


thank you

irma