Since grub should still be setup on your Linux partitions, its just the first stage you should need to restore. and also know which parition the /boot directory was on ( or if it has one of its own ). if its the first partition of the primary master it would be hda1, but in grub parlance (hd0,0).
If you have the SUSE CD, boot with that, and see if theres an emergency or recovery boot, all you need is a login with root. then type the following
Code:
grub
root (hd0,0)
setup (hd0)
quit
You should replace (hd0,0) with where your /boot directory is. If you don't know where it is ( or your unsure ) before typing in the root command type "find /boot/grub/stage1" (without quotes) this should return the proper parameter for the root command. Setup will install stage1 in the master boot record.
Now just reboot and grub should be back.