GRUB Confusion for Separate Ubuntu & Mepis Installations On Two Separate Hard Drives - sda & sdb

Hello,

I'm building a computer as a Christmas gift for a family member.

a) I'm building with two separate hard drives, each will host a different Linux distro - Ubuntu 8.10 on sda and Mepis 7.9.93 on sdb.

b) I installed Ubuntu 8.10 on sda perfectly

c) I had a legacy Ubuntu 8.04 install on sdb, and decided to replace it with an installation of Mepis.

d) When going through the Mepis install, even though I designated it go on sdb, it asked me if I wanted to install GRUB in MBR with Mepis GRUB

e) I picked "Don't install GRUB" as I thought it would overwrite my Ubuntu GRUB on MBR

f) When I rebooted machine, Ubuntu GRUB showed new Ubuntu 8.10 install on sda, and instead of my new Mepis install on sdb, it showed legacy Ubuntu 8.04 on sdb

g) Of course, if I selected "Ubuntu 8.04" as boot option, it showed "File Not Found"

h) So I loaded the Mepis live CD, went to live session, selected "System Assistant", and attempted to repair grub, indicating GRUB MBR should be on sda, and Mepis install was on sdb

i) Mepis wrote a new MEPIS-centric instance of GRUB to the sda MBR, and listed Mepis first, out of order, and Ubuntu 8.10 second, and the entire GRUB instance has Mepis art and branding. This would confuse my gift recipient.

My question is, is there a safe and clean way to get the Ubuntu-centric GRUB instance back, and have it show Ubuntu 8.10 as first choice, and Mepis as second choice?

I'm not terribly technical (or I wouldn't have screwed up like this.) I would greatly appreciate any help you could provide that might help me avoid having to reinstall Ubuntu 8.10 completely.

Thanks

Jackson