Thanks P2C2E,
thanks Stephen,

its working.
Actualy I am writing this in my old beloved hda6-system.
There was no need tore boot from CD, just uisng the hda9 system.

This is what I did:
jan@testboxhda9:~$ su root
Password:
root@testboxhda9:/home/jan# mount /dev/hda6 /mnt/hda6
root@testboxhda9:/home/jan# chroot /mnt/hda6 /sbin/lilo -b /dev/hda6
Ignoring entry 'boot'
Warning: '/proc/partitions' does not exist, disk scan bypassed
Added Linux *
Added LinuxOLD
after that
root@testboxhda9:/home/jan# lilo
Added Linux *
Skipping /vmlinuz.old
Added Windows(hda1)
Added Windows(hda5)
Added Linux(hda3)
Added Knoppix(hda6) <- Jiiiiipeeeeeeee !
root@testboxhda9:/home/jan#

Indeed, now there are two lilos to run to boot hda6.
I am thinking about how to make the second one to run without interaction needed?

Thanks,
JanMartin