Move by a screen's worth

I'd like to know if there is a way in Audition CS6 to move the waveform forward and backward by a screen's worth...or half a screen's worth...by using a keystroke or a shortcut key.

I find dragging the playhead or the selected area at the top clumsy when editing a fairly long file, which I have to do every day.

Thank you.

-Pete

Somers, WI