The other version of this song's intro was way more complicated than it had to be and 
the heavy part was wrong. So here's my version...It sounds good to me when I play along 
with the CD.

Drop D tuning. I know the band doesn't use this tuning in the entire CD but I'm pretty 
sure they use it for this song because it sounds perfect.

Intro. Sounds accoustic to me.
B--6-----6-----5-----5-----5------
G----7-----7-----7-----7-----7----
D------7-----7-----7-----7-----7--

Also can be played like this...
E--1-----1-----0-----0-----0------
B----3-----3-----3-----3-----3----
G------2-----2-----2-----2-----2--

Next...
E----------(later in the intro>)--10--
B-------------------------------------
G--5/7----7----5/7----7----5/7--------
D--5/7--7---7--5/7--7---7--5/7--7-----

D--x-x--0--0--3-3//10--10--x-x-6-6--0--
A--x-x--0--0--3-3//10--10--x-x-6-6--0--
D--x-x--0--0--3-3//10--10--x-x-6-6--0--