Screensaver deactivation

Sorry, this is in English.

I use the Nokia 9210 with TomTom routplaner a lot in my car. But the screensaver (power down) function irritates me. I have to keep pushing some button to get the light back on. Is there anyway that i can make the screen not go out when i use it with my carkit? The light in the front display keeps on, but not the light inside the lid.
By the way, i modified a Carkit so i could have my phone open on the dashboard, pretty sweat :-)

With kind regards
Franz Eckert