ISO to USB-HDD? (using HDD as install medium)

[shadowslayer]

I have scoured the internet with no success. I have asked all my geeky friends in real life. No one know what I'm trying to do. I'm working with 10.5 because I heard greater results with installing on an EEE-PC 900a. So I'm working with kalyway for now. I do NOT have a DVD drive to install from so I am trying to figure out how to clone this ISO to a HDD partition and install from that. I know that once I get the ISO on I will probably have to mess with the bootloader/sector (even though this HDD has OSX 1.6.2 currently installed on it so perhaps not if the bootsector keeps). I may also be searching for the wrong thing so if I am, and this is a common element in guides, I apologize.

 

Kalyway 1.5.1

Eeepc 900a

No DVD drive (internal or external)

USB-HDD 320GB

USB drive 8GB

OSX10.5 Macbook pro to use