If you don't have Partition Magic 5.0 (which would make all of this rather painless for you) you might want to have a look at http://www.users.intercom.com/~ranish/part
You'll find a decent freeware partition manager there, as well as a boot manager (but I'd stay with LILO)...and I believe the source code is there if you're inclined to play with it, but it's a separate file.
Repost if that doesn't do it for you and I'll get back to you with a solution for your specific problem. I should be online until 4 AM IST and check email frequently. I'm also off tomorrow and will have more time for a specific response then. Good luck.
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