Change the default entry on the floppy in file grub.conf or add another entry like:
kernel /vmlinuz-2.6.10 ro root=/dev/VolGroup00/LogVol00 rhgb quiet
My example has an LVM setup (/dev/VolGroup00/LogVol00). Obviously you must change the path to your hard disk (maybe something like /dev/sda1).
This way booting starts from floppy, but will load the system from the hard disk.