Installation of 5.3 over network fails on boot up.

[Joe Dunsmore]

I was going to install 5.3 on a computer using the install over network 
option.  I imaged boot.flp, kern1.flp, and kern2.flp to floppy disks using dd 
(not cp) and started the computer up with the boot disk in the drive.  After 
seeing the ascii spinning thing (|, /, -, \, etc.), the computer spit this 
out:

error 4 lba 248
Invalid format

FreeBSD/i386 boot
Default: 0:fd(0,a)/kernel
boot:
No /kernel

FreeBSD/i386 boot
Default: 0:fd(0,a)/kernel
boot:


I tried this on a few different disks, so that's not the problem.  Any ideas 
what's wrong?