How to boot Leopard with linux opensuse grub?

[Fantasmeo]

This is my disk partition table:

Nome Flag Tipo part. Tipo FS [Etichetta] Dim. (MB)

------------------------------------------------------------------------------

] sda1 Primaria NTFS [ 115343,11

sda2 Avvio Primaria Sconosciuto (AF) 62915,17

sda3 unformatted 3142,06

sda5 Logica Linux swap / Solaris 2155,03

sda6 Logica Linux ext3 7106,65

sda7 Logica Linux ext3 9385,05

I've installed first windows vista on sda1, then mac os leopard kalyway 10.5.1 on sda2 (sda 3 is for data) finally i've installed linux opensuse on sda4 extended (sda5+sda6+sda7)(Swap, root and home linux partitions). With opensuse grub i can boot vista and opensuse but i'can't to boot leopard. What i've to add at the menu.list grub config file? How can i boot leopard from my grub?

P.S.

In leopard installation i DID NOT install the bootloaders (guid or mbr) but only the vanilla kernel because i want to boot it with grub. Help me please.

I'm sure is a boot problem because, i've installed leopard with darwin bootloader a mounth ago and it worked... (i'm italian, sorry for my BAD english )