You could change the /etc/lilo.conf boot= entry to boot=/dev/fd0. Mount a blank disk, and execute /sbin/lilo as root. The boot= entry tells lilo where to install the boot loader when you call /etc/lilo.
If you have XP you could follow the instructions for using the NTLDR XP loader to boot Linux:
The mkbootdisk program will fail because the kernel is now to large to fit on a floppy. Mandrake's version of the program doesn't have an --iso option to produce a boot cd, but 'mkrescue --iso'
will. This will produce a bootable rescue cd which has an option to boot from hard drive.