GRUB setup for multi-boot ISO from memory stick

[Intense Red <intnsred@golgotha.net>]

   I've been trying to set up Testing/Wheezy's DVD ISO to boot from a memory 
card/USB thumb drive, as outlined at http://www.pendrivelinux.com/boot-
multiple-iso-from-usb-via-grub2-using-linux/

   I have the *.iso file renamed "debian.iso" and put in the root directory of 
the USB drive/memory card. GRUB is installed on the card just fine and it boots 
and acts like it should.

   My problem is configuring GRUB to boot the Debian ISO file. My GRUB menu.cfg 
entry is:

menuentry "Debian ISO" {
 loopback loop /debian.iso
 linux (loop)/install.386/vmlinuz boot=install.386 iso-
scan/filename=/debian.iso noeject noprompt splash --
 initrd (loop)/install.386/initrd.gz
}

   This boots the ISO file and starts the Debian installation. The installation 
goes along just fine until the install program asks me where the CD-ROM is. The 
computer doesn't have CD-ROM and I want the installer to read the debian.iso 
file as the "first" (and only) CD-ROM. But I can't seem to "see" the *.iso file 
from the booted kernel even though the kernel is booted from the debian.iso 
file.

   Does anyone know how to properly configure the grub.cfg entry so that it 
will both boot from the *.iso file and so I can tell the installer to use the 
same *.iso file as the "CD-ROM"?

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