Netboot with multiple images

Hi,

I have a netboot server set up here at my office. Everything works well, but my question is this...

Can you option boot, or the equivalent, and be able to pick one of the other images that are not default. As it sits, you hold down N, or option boot and the default image is the one that boots. To get to any of the other images, you have to boot into an OS and choose the other image in system preferences under startup disk. All I want to do is be able to choose a different image other than the default at startup. Any solutions to this would be much appreciated! Thanks.