Your idea won't work because you must make one boot loader to boot the two systems and Grub is 10 times easier than Windows NTLDR.
The Grub and Windows MBR can be restored as often as you want so no need to worry about losing any or both of them. Methods of restoring them are described in Task B section of the last link in my signature.
Switching the bios to select from two systems to boot is a pretty old school. Have a look at the 2nd link of my signature and move with time.
Last edited by saikee; 04-15-2006 at 01:20 PM.