Installing OS from a disk image

Hi,
I have quite a few systems that I need to rebuild. I've burned disk images of all the apps we need, onto a FW800 drive which has really sped things up. One thing I can't figure out though, is how to install the OS from a disk image. Each of these systems are getting a fresh hard drive with no OS installed. Booting off the install DVD works fine with fresh drives, but how does one boot into a FW800 drive with a disk image of the install DVD?
I thought cmd-opt-shift-delete was the key stroke for this, but it doesn't work for these systems, can anyone help out?
These systems are a combination of Leopard and Snow Leopard and are all Mac Pro's from the 2006-2007 to the early 2009 models.
Thanks
Stuart

Cool, thanks, I was kind of thinking along those lines, but couldn't quite put my finger on it/figure it out, that makes sense, appreciate it.
Thanks again for quick reply,
Stuart

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