Hoping my english will not betray me, i want to share my problem, and maybe be usefull for you in something else.

On my notebook i've installed windows (i know, but i need it), Debian Sid and Backtrack 3, but i've no idea about how to boot backtrack, i've searched a long but noghing seems to work.

Code:
Black-Star:/home/xeron# fdisk -lu

Disk /dev/sda: 250.0 GB, 250059350016 bytes
255 heads, 63 sectors/track, 30401 cylinders, total 488397168 sectors
Units = sectors of 1 * 512 = 512 bytes
Disk identifier: 0x4d2e4d2d

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *          63   163846934    81923436    7  HPFS/NTFS
/dev/sda2       163846935   167847119     2000092+  82  Linux swap / Solaris
/dev/sda3       167847120   460808459   146480670   83  Linux
/dev/sda4       460808460   488392064    13791802+  83  Linux
sda1 Win
sda2 Swap
sda3 Debian Sid
sda4 Backtrack 3

and that's the grub.cfg

Code:
#
# DO NOT EDIT THIS FILE
#
# It is automatically generated by /usr/sbin/update-grub using templates
# from /etc/grub.d and settings from /etc/default/grub
#

### BEGIN /etc/grub.d/00_header ###
set default=0
set timeout=5
set root=(hd0,3)
search --fs-uuid --set 50f84cfb-5b31-4e8c-88a4-75393e04ed94
if font /usr/share/grub/ascii.pff ; then
  set gfxmode=640x480
  insmod gfxterm
  insmod vbe
  terminal gfxterm
fi
### END /etc/grub.d/00_header ###


### BEGIN /etc/grub.d/05_debian_theme ###
set root=(hd0,3)
search --fs-uuid --set 50f84cfb-5b31-4e8c-88a4-75393e04ed94
insmod png
if background_image /boot/grub/debian-blueish-wallpaper-640x480.png ; then
  set color_normal=black/black
  set color_highlight=magenta/black
else
  set menu_color_normal=cyan/blue
  set menu_color_highlight=white/blue
fi
### END /etc/grub.d/05_debian_theme ###

### BEGIN /etc/grub.d/10_hurd ###
### END /etc/grub.d/10_hurd ###

### BEGIN /etc/grub.d/10_linux ###
set root=(hd0,3)
search --fs-uuid --set 50f84cfb-5b31-4e8c-88a4-75393e04ed94
menuentry "Debian GNU/Linux, linux 2.6.26-1-686" {
	linux	/boot/vmlinuz-2.6.26-1-686 root=/dev/sda3 ro  
	initrd	/boot/initrd.img-2.6.26-1-686
}
menuentry "Debian GNU/Linux, linux 2.6.26-1-686 (single-user mode)" {
	linux	/boot/vmlinuz-2.6.26-1-686 root=/dev/sda3 ro single 
	initrd	/boot/initrd.img-2.6.26-1-686
}
### END /etc/grub.d/10_linux ###
menuentry "BackTrack 3" {
        kernel /boot/vmlinuz root=/dev/sda4 ro
}


### BEGIN /etc/grub.d/30_os-prober ###
### END /etc/grub.d/30_os-prober ###

### BEGIN /etc/grub.d/30_otheros ###

# This entry automatically added by the Debian installer for a non-linux OS
# on /dev/sda1
menuentry "Microsoft Windows XP Home Edition" {
	set root=(hd0,1)
	chainloader +1
}
### END /etc/grub.d/30_otheros ###

### BEGIN /etc/grub.d/40_custom ###
# This file is an example on how to add custom entries
### END /etc/grub.d/40_custom ###
thanks a lot for the help!