Arduino Mega PWM frequencies

Hello, I have been using the PWM cheatsheet by MageGR on how to change the default timer prescalers for timers 0, 1, and 2 on the Arduino Duemilanove and that works great...

Does anyone know how to change them on the Arduino Mega? It has 12 PWM outputs and 6 timers (I think). I tried looking through the datasheets for both the atmega168 and the atmega1280 looking for the lines from this page:

like this line: TCCR0B = TCCR0B & 0b11111000 | 0x01;

I've come up empty-handed on this one - anyone have any ideas where to point me or possibly this is already done somewhere?

Thanks, JD