[Tfug] kernel issues 2.6.15

[ken]

im trying to run 2.6.15 have grub setup to boot it with root=/dev/hda3
and ext3 is built into the kernel this is what i get when i try to load
it vfs cannont open root device "hda3" or unknown-block (0,0) please
append a correct root= boot option kernel panic - not syncing :VFS :
unable to mount root fs on unknown-block(0,0) 

this is my menu.lst config for that particular kernel 
title           Debian 2.6.15
root            (hd0,2)
kernel          /boot/vmlinuz-2.6.15 root=/dev/hda3 ro
its debian sarge i have 1 partition for / and that covers everything
anyone have any ideas of why its asking for a correct root=option to me
it seems ive covered all the bases