How to add these ISOs with grub4dos to multiboot USB Stick?

I added on a multiboot USB stick the JonDo LiveCD anonymization software available for free from here:

http://anonymous-proxy-servers.net/en/software_win.html

The following grub4dos statements were setup for JonDo:

title Boot jondo-v0.9.47live-cd.iso
find --set-root --ignore-floppies --ignore-cd /multiboot/ISOS/jondo-v0.9.47live-cd.iso
map --heads=0 --sectors-per-track=0 /multiboot/ISOS/jondo-v0.9.47live-cd.iso (hd32)
map --hook
chainloader (hd32)

When I boot from USB Stick then JonDo starts booting at first but complains later that the LiveCD cannot be found.  Why?

What do I have to change in the grub4dos statements above?

Similarly I could NOT add the AntiVirus LiveCD TrinityRescue Kit CD available from here:

http://trinityhome.org/Home/index.php?content=TRINITY_RESCUE_KIT_DOWNLOAD&front_id=12&lang=en&locale=en

When I add them with the grub4dos statements:

title Boot trinity-rescue-kit.3.4-build-372.iso
find --set-root --ignore-floppies --ignore-cd /multiboot/ISOS/trinity-rescue-kit.3.4-build-372.iso
map --heads=0 --sectors-per-track=0 /multiboot/ISOS/trinity-rescue-kit.3.4-build-372.iso (hd32)
map --hook
chainloader (hd32)

then TRK could boot but not completely start because the boot media is not found.

Whats wrong here with the grub4dos statements?

I want to mention that all other Live CD ISOs could be added and started from the USB stick wihtout problems. So USB stick setup in general should not be that problem.

Thank you

Peter