Editing grub menu

I'd like to edit the Grub menu that comes up, to move one line and remove others. I have an Inspiron 1420 that came with Ubuntu 7.10. When it needed a new drive, I installed Windows 7, the original OS, and then it seemed that 10.04 wanted its own partition. I probably should have checked exactly what I was doing first (famous last words). What I'd like to do is remove the 7.10 lines entirely, so I can blow away everything in that partition and use it as /home for 10.04. I'd also like to move the Windows 7 line up to second from the top, so booting in Windows would be a quick two keystrokes rather than following the line all the way down. Hitting the Grub edit key came up with unclear instructions, and since this is the boot loader I'd kind of rather not screw it up too bad. So, what's the best way to do this?