Unless 7.3 has some new feature that does this automatically for you?
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You don't need a jumper as long as that HardDrive is the only thing on the IDE chain.
If I understand it, you esstentially want everything in /var/www to be on your harddrive, and the HD to serve as the new /var/www.
Here's what you need to do:
1. mkdir /mnt/newdrive
2. mount -t ext3 /dev/hda1 /mnt/newdrive
3. cp -Rp /var/www /mnt/newdrive
4. vi /etc/fstab <- add the new drive and put the mount point as /var/www
This should make your new drive appear as /var/www. The above may not be perfect, and you may have to change some stuff, but it at least gives you a starting point. There are lots of tutorials and newsgroup posting about adding drives. Do a search on Google.