Help with Diskless grub booting with Diskimages

[Neal Lawson]

I have building a Lab for the CS department here, and i was using
etherboot to load grub then from grub i have a netowrk boot linux but i
also need to boot a disk image how do i do that? 

i made a disk image using dd if=/dev/fd0 of=filename and i copied that
file to my tftpboot directory i know i can use etherboot to book a disk
image but i would rather use grub..

Thanks for you help