mount: can't find /home in /etc/fstab or /etc/mtab

Hi all I tried moving my /home directory to another partition( http://www.psychocats.net/ubuntu/separatehome). Thing were ok I think till I typed "gksudo gedit /old/etc/fstab". I got an error msg on the gedit page & when I tried to login to ubuntu aghain I get the msg "your home directoy doesnot exist. Do you want to log in with the /root directory as your home directory? Tried to correct it as per instructions but I get the msg no such file or directory.
Searching around I seen that in text mode I can see the home_backup directory containing all my files, so how can I complete shifting my home directory to the other partition & keep ubuntu on my 1st partition or set things correct.
I have 2 hdd one a 40 gB having Hda1 & Hda2 ( containing win XP & Win 98) and the 2nd a 80 GB with Hdb1&2. Hdb1 contains Ubuntu 6.06 lts & was trying to move my home directory to HDB2 as I wanted to change to 8.10
Also I cannot use my Live Cd as my old Cdrom wwas faulty & I just have got a Sata DVD writer which is connected to the mobo through a pci raid controller. How can I get the bios to regognise the optical drive.

Please help

I had earlier posted my question no 66862 for which I had given additional information as requested.