Just download unetboothin and use it to load your CD image file to usb flash drive.
Get unetboothin at:
http://unetbootin.sourceforge.net/
How to install and run Ubuntu in USB flash disk?
a. donwload Ubuntu 8.10 from ubuntu.com
b. run or install the cd on any desktop PC
c. copy the whole cd to a USB disk: System-->Administration-->Create a USB start disk
d. put the USB disk in your Eee PC and start to install