yes that's not a problem.
title=Gentoo Linux 2.6.9-gentoo-r9
kernel /boot/kernel-2.6.9-gentoo-r9 root=/dev/ram0 real_root=/dev/hda5 init=/linuxrc splash=verbose
if you look at the last part, you'll see the entry for my Windows partition. You'll have to remember about the naming convention as i.e. if you windows partition/drive is the first one, the entry would look pretty much like mine, whereas your linux entry would be different because if it's on a second hard drive it's gonna be something like root (hd1,0) - yes it does make a difference cos if you used my entry, you'd be pointing it at the wrong place, and it's either wouldn't boot the linux or you may get a big screen full of GR 99 99 99 99 99 99's
also, notice my top line for the default - it's 1 not 0 and the line in the windows section says "chainloader + 1, so the grub knows that that's what I want to highlight as the default.
Maybe that helps a little?