For this song, you have to tuned all the way down to B, no not, D, B as in....erm,...band. On the A 
and D string, you hafta do alternative picking cuz it has to be real fast.

The first bit...
B--0-0-------------0-0--------------0-0---------------------------x----------------------------------------------------------------
A-------2-2-2-2---------5-5-5-5---------------------------------3--------------------------------------------------------------
D-------------------------------------------5-5-5-5----------------5-----------------------------------------------------------------
G--------------------------------------------------------------------5----------------------------------------------------------
B---------------------------------------------------------------------------------------------------------------------------
e---------------------------------------------------------------------------------------------------------------------------


B-----x--------------x------------------------------------------------------------------------------------------------------
A-----5-------------5---------------------------------------------------------------------------------------------------------
D-----x-------------x-----------------5------------7--------------------------------------------------------------------------
G-----x-------------x-----------------x------------x-------------------------------------------------------------------------
B-----7-------------7------------------x-----------x--------------------------------------------------------------------------
e-----5--------------5-----------------8-----------10------------------------------------------------------------------------

that's all i've figured out...you basically play the first bit throught the first verse and the second part 
during the chorus