1. Get a floppy
2. Login to Linux and format the floppy:
mke2fs -t /dev/fd0
3. copy your .img file to /tmp
4. cd /tmp
5. dd if=/tmp/your_file.img of=/dev/fd0 bs=1440k
6. Boot normally from the Linux installation CD-ROM
7. Type "Linux dd" at the boot prompt.