If you have grub installed on your SuSE partition, there may be an option to 'repair SuSE on the install CD, I would check there first. If not, you'll need to boot to the SuSE partition to re-install GRUB to the MBR. You can usually use some kind of linux boot disk, and probably your SuSE install CD to boot back to SuSE temporarily. There are instructions for the installation of GRUB at the GRUB manual site here: http://www.gnu.org/software/grub/man...-natively.html
Hopefully that will work out for you.