Yes, this topic is everywhere...
You can install GRUB in the MBR of the primary IDE and go from there.
You will also need to map the disks.
In this forum, do a search for
dual boot grub, you will find many Threads concerning your question.
Also, if you need more information concerning GRUB configuration, the GRUB Manual
is available.
http://www.gnu.org/manual/grub-0.92/grub.html