It's pretty easy to set up Wes.

Unzip the two files on your external memory card.

In Xterm, do the following.

sudo cp /media/mmc1/on /usr/bin/
sudo cp /media/mmc1/off /usr/bin/
sudo chmod +x /usr/bin/on
sudo chmod +x /usr/bin/off

In Personal Menu, I have two shortcuts.

Notifications On
and
Notifications Off

The commands to execute them are simply
on
off

Just note that you'll get a slightly faster battery drain since it's doing 1 minute checks for new messages.