booting from floppies, installing from ISO image on USB stick - is it possible ?

[Andrew <andp@clear.net.nz>]

Hi 

I have some Dell Optiplex (500 Mhz) boxes without 
 - CD-ROM 
 - ability to boot from USB (no such option in BIOS).

The idea is to boot the box from floppies and use an USB
stick with Debian .iso image.

When booting from floppies (DISTRIB_RELEASE=3.1, installer
build 20060304)- from logs:

---------------------
discover: usb-uhci;;;Intel Corporation;82801AA USB;
--
/proc/pci:   Bus  0, device  31, function  2:
/proc/pci:     USB Controller: Intel Corp. 82801AA USB (rev
2).
/proc/pci:       IRQ 11.
/proc/pci:       I/O at 0xff80 [0xff9f].
--
lsmod: usb-storage            54240   0 (unused)
lsmod: scsi_mod               85860   1 [sd_mod usb-storage]
lsmod: ide-core               91672   0 [usb-storage]
lsmod: input                   2848   0 [keybdev usbkbd]
lsmod: usbcore                52044   0 [usb-storage usbkbd]
--
/proc/ioports: ff80-ff9f : Intel Corp. 82801AA USB
--
Mar 30 10:20:18 kernel: usb.c: registered new driver
usbdevfs
Mar 30 10:20:18 kernel: usb.c: registered new driver hub
Mar 30 10:20:18 kernel: usb.c: registered new driver usbkbd
Mar 30 10:20:18 kernel: usbkbd.c: :USB HID Boot Protocol
keyboard driver
--
Mar 30 10:20:18 kernel: Initializing USB Mass Storage
driver...
Mar 30 10:20:18 kernel: usb.c: registered new driver
usb-storage
Mar 30 10:20:18 kernel: USB Mass Storage support registered.
--
Mar 30 10:20:33 kbd-chooser[916]: DEBUG: Mounting usbdevfs
to look for kbd  
Mar 30 10:20:33 kbd-chooser[916]: DEBUG: Parsing
/proc/bus/usb/devices  
Mar 30 10:20:33 kbd-chooser[916]: DEBUG: Adding generic
entry for USB keymaps  
Mar 30 10:20:33 kbd-chooser[916]: INFO: keyboard type at:
present: unknown    
Mar 30 10:20:33 kbd-chooser[916]: INFO: keyboard type usb:
present: unknown  
---------------------

Could not find solution so far and have very limited
experience with Debian install.

Any ideas?

Thank you
Andrew