dual boot Backtrack 3 and Ubuntu 8.04

[Evil Monkey]

I have installed BT3 and ubuntu 8.04 using grub boot loader,iam getting the options to select the both the OS while booting grub,iam able to boot to ubuntu but iam not able to boot BT3 it says

Error 15:file not found


Partitions details

sda1 =boot
Sda2=swap
sda3=/ (BT3)
sda4=extened
sda5=ubuntu
sda6=linux swap


here is my grub details

## ## End Default Options ##

title Ubuntu 8.04, kernel 2.6.24-16-generic
root (hd0,4)
kernel /boot/vmlinuz-2.6.24-16-generic root=UUID=d5c43311-5a5e-4b94-a1$
initrd /boot/initrd.img-2.6.24-16-generic
quiet

title Ubuntu 8.04, kernel 2.6.24-16-generic (recovery mode)
root (hd0,4)
kernel /boot/vmlinuz-2.6.24-16-generic root=UUID=d5c43311-5a5e-4b94-a1$
initrd /boot/initrd.img-2.6.24-16-generic

title Ubuntu 8.04, memtest86+
root (hd0,4)
kernel /boot/memtest86+.bin
quiet

### END DEBIAN AUTOMAGIC KERNELS LIST
title Backtrack 3 KDE
rootnoverify (hd0,2)
kernel /boot/vmlinuz vga=791 root=/dev/sda3 ro autoexec=xconf;kdm
boot




please let me know what is the issue in grub