well that's what grape juice usually does to electronics. in seriousness, i feel kind of sorry for you. i did the same to my dad's keyboard with soda which in addition to ruining the keyboard, a lot of the liquid from the spilling hit the computer and ultimately screwed it up. courtesy of my dad, hell rose after that :L
as Georges said, you can easily get a spare DVD drive, so this shouldn't be too much of an ache to fix.