How to boot Linux system by XP and use XP to create multiboot menu

1. Make sure you have install stage1 (GRUB) to MBR or boot sector first.
2. Install XP and use Linux DVD boot into Linux system.
3. "dd if=/dev/hda1 of=/boot.img bs=512 count=1" to dump MBR or boot sector's bootloader into 1 file, and name it boot.img.
4. Copy boot.img file into XP system C: and add 1 line into tail of c:\boot.ini file as followings.
c:\boot.lnx="Linux system name"
5. Reboot and then you will see the multi boot option, and sure you should can get into that Linux OS.