I am almost 100% sure it's drop D tuning, but i can be mistaken
You can also try slighty PM it, when you want.

Main Riff

E-------------------
B-------------------
G-------------------
D--2--2--3/5--3\2---
A--2--2--3/5--3\2---
D--0--0--1/3--1\0---

play that about 3x

then...
E-------------------
B-------------------
G-------------------
D--2--2--6--6--6----
A--2--2--6--6--6----
D--0--0--4--4--4----

song can be a little tricky...good luck