Okay, this is pretty easy... here it goes:

(clean)
-----------------------------------------------|
-----------------------------------------------|
-----------------------------------------------|
---4-4-5-7-5-4---------------------2-2-4-5-4-2-|
-5-------------5---4-4-5-7-5-4---2-------------|
-----------------5-------------5---------------|

-----------------------------------------------|
-----------------------------------------------|
-----------------------------------------------|
-----0-0---0-0-----4-4-5-7-5-4-----------------|
-4---------------5-------------5---4-4-5-7-5-4-|
---3-----3-----3-----------------5-------------|

-----------------------------------------------|
-----------------------------------------------|
-----------------------------------------------|
-----2-2-4-5-5-4-4-0-0-0-0-0-0-0-0-------------|
---2-------------------------------------------|
-5---------------------------------------------|

okay now this part is fast up and down strumming... but still clean

-----------------------------------------------|
-----------------------------------------------|
-----------------------------------------------|
-----------------------------------------------|
-16-16-16-16-16-16-14-14-14-14-14-14-16-16-16--|
-14-14-14-14-14-14-12-12-12-12-12-12-14-14-14--|

-----------------------------------------------|
-----------------------------------------------|
-----------------------------------------------|
-----------------------------------------------|
-16-16-16-12-12-12-12-12-12--------------------|
-14-14-14-10-10-10-10-10-10--------------------|

okay now repeat that four times getting harder and louder as you go.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

this is the loud distortion part before tom starts to sing:

------------------------------------------------|
------------------------------------------------|
------------------------------------------------|
------------------------------------------------|
5-5-5-5-5-5-------------2-2-2-2-2-2-------------|
------------5-5-5-5-5-5-------------3-3-3-3-3-3-|

repeat that a couple times
there's your intro... enjoy! :)

email me w/ any questions or comments: GuitarPunk540@aol.com