Networking :: Get GPXE Or PXElinux To Boot From The Cd Drive?

I have successfully set up a tftp/dhcp server from which to deliver gPXE or PXElinux, so my machine can boot from iSCSI (there is no hard drive). Using either one (I prefer gPXE to keep thing simple), when iSCSI boot fails (e.g. the iscsi target is empty), the iSCSI target is successfully retained as a device in BIOS, and the BIOS is supposed to move to the next boot device, in this case the DVD drive. However it does not. So in order to be able to install Windows to the iSCSI drive I need to either get gPXE or PXElinux to instruct it to boot from the first optical drive after sanboot fails, or set up a PXE image server to load the Windows DVD from, which I don't really have time to do.

I've scoured the web for instructions on how to get either of these to do a local optical drive boot, but all I can find is codes to boot from hard drives or floppies.

I figured networking would hit the most people experienced with PXE and gPXE...

p.p.s. Here are my files so you know what I'm doing:

dhcpd.conf

Code:
allow booting;
authoritative;
option space gpxe;
option gpxe-encap-opts code 175 = encapsulate gpxe;
option gpxe.keep-san code 8 = unsigned integer 8;

[Code].....

Note: Yes, I know I can do a UI based menu for this, I'll set that up once I have everything working. I added the loader label because I read that it would execute a boot loader that I could use to select the DVD drive, but it doesn't work yet. The way it's set up, PXElinux fails when I execute "loader". It says kernel memdisk not found even though memdisk.bin is in the same directory, and when i change it to

Code:
kernel memdisk.bin

it just hangs. The files are from SYSlinux 4.0.3 and am using gPXE 1.0.1. I'm sure I've missed something fundamental, this is my first time using PXElinux. Or network booting at all really.