How to configure grub for ubuntu tripple boot
 

Hello friends ,
I've installed XP , then open Suse11.0 then Ubuntu 8.04 on i386 machine.
Well when dual booting with XP both Open Suse & Ubuntu recognize XP automatically, but failed to recognize other Linux distro at tripple booting..
Right now I can access xp & ubuntu , but not suse , please suggest appropriate changes in grub of ubutu .

the boot partitions are on /sda (0,4) open suse
/sda (0,8) ubuntu 8.04