First boot with your knoppix-CD, because I don't now how Linux reacts if you move /home while it is running.

Then mount your root-Partition (cd into it) and move /home somewhere else (e.g. /home_save). Now type 'mkdir home', 'mount /dev/hda7 home' and move your directorys from /home_save to /home.

The last step is to edit /etc/fstab and add the following line:

/dev/hda7 /home ext3 defaults 1 2


There are probably easier ways, but I think that this should work.