i dont use grub or knoppix, so this isnt very explicatory, and may not work at all, but you could try:
Code:
title Boot from CD
root (hd1,0) # or whatever hd* you want
kernel /location/of/kernel/on/knoppix/disk root=/whatever/knoppix/sets/root/partition/to
i would advise you to try inserting your knoppix cd, then going into the grub boot prompt and trying to boot to the cd from there. that would be much safer, and you could experiment more easily.
