grub4dos booting ubuntu iso

this has been discussed but i never seem to find an answer that works for me.
basically i have grub4dos installed and ubuntu 8.10 and 9.04 and i don't care which works just wanna get something started. i could use unetbootin but i have larger dreams here. anyways.
when i run grub4dos with this entry

title ubuntu

find --set-root /ubuntu.iso

map /ubuntu.iso (hd32)

map --hook

chainloader (hd32)

boot

it loads up to loading, please wait. . .
(initramfs)
and then hangs.
i have other issue's but i figure if i can get this running then ill deal with the other stuff later. i have been working with grub4dos for only a few days but it has been a constant thing for me for at least 48 hours now haha.
i also have another question about what the hd32 means....