HD Install :: Triple Boot Install

Greetings and salutations. I have a 8GB drive split in two equal partitions. A second 4.2GB drive slaved to the first. Win 98 is installed on the first partition and Ubuntu is installed on the slave drive. I want to install DSL on the second partition of the first drive. From what I've read I'll need to modify the bootloader and possibly the HD install procedure. My question is what would be the best way to accomplish this? I've read quite a bit and am not sure exactly what steps to take.

original here.