I believe that all you need to do is download and run Kano's install script. Then the drivers will be automatically downloaded and installed for you.

You can get it here:
http://debian.tu-bs.de/knoppix/Kano/...tall-nvidia.sh

After downloading it, make it executable like this:
chmod +x install-nvidia.sh

Then run it as root like this:
./install-nvidia.sh

I would run it with X closed however.

I believe this script is a variation on Fabian's CD version, which you can find here:

http://www.knoppix.net/forum/viewtopic.php?t=4016#18817