alright so i looked for this tab and it was ok but they had the chords all effed up so i 
gonna fix it:

Verse:

e-2-----------------3-----------------------------|
b-3-----------------3-----------------------------| this riffed is played for the
g-2-----------------0-----------------------------|           entire verse
d-0------4-----4----0------5-----5h7p5------------|
a-0--4h5---4h5---5--2--4/5---4/5------------------|
e-2-----------------3-----------------------------|

Chorus:

e-2-----------------3------------------|
b-3-----------------3------------------|
g-2-----------------0------------------|
d-0------4-----4----0------5-----5h7p5-|
a-0--4h5---4h5---5--2--4/5---4/5-------|
e-2-----------------3------------------|


on the first chorus its weird and different than the second chorus. you play the verse 
the first half of the chorus but then for the second half you play these chords:


   Bm      D      G    Bm       A
e---2------2------3-----2-------0-------|
b---3------3------0-----3-------3-------|
g---4------2------0-----4-------3-------|listen to the song for strumming
d---4------0------0-----4-------3-------|             patterns
a---2------0------2-----2-------0-------|
e---2------0------3-----2-------0-------|

then the verse is played again:

e-2-----------------3------------------|
b-3-----------------3------------------|
g-2-----------------0------------------|
d-0------4-----4----0------5-----5h7p5-|
a-0--4h5---4h5---5--2--4/5---4/5-------|
e-2-----------------3------------------|


then the second chorus but this time it only plays the chords:

   Bm      D      G    Bm       A
e---2------2------3-----2-------0-------|
b---3------3------0-----3-------3-------|
g---4------2------0-----4-------3-------|
d---4------0------0-----4-------3-------|
a---2------0------2-----2-------0-------|
e---2------0------3-----2-------0-------|


Verse:
e-2-----------------3------------------|
b-3-----------------3------------------|
g-2-----------------0------------------|
d-0------4-----4----0------5-----5h7p5-|
a-0--4h5---4h5---5--2--4/5---4/5-------|
e-2-----------------3------------------|

the riff played when dave is singing "When All The Little Ants Are Marching..." and it 
basically just working off of the G chord and the low e string so basically make a G and 
this strumming pattern (below):

Riff:

e-----------------------------------------|
b-----------------------------------------|
g-----------------------------------------|  {x4}
d-----------------------------------------|
a--2-2-2--2-2-2--2-2-2-2-2-2--------------|
e--3-3-3--2-2-2--0-0-0-0-0-0--------------|

Verse:

e-2-----------------3------------------|
b-3-----------------3------------------|
g-2-----------------0------------------|
d-0------4-----4----0------5-----5h7p5-|
a-0--4h5---4h5---5--2--4/5---4/5-------|
e-2-----------------3------------------|

Chorus:

e-2-----------------3------------------|
b-3-----------------3------------------|
g-2-----------------0------------------|
d-0------4-----4----0------5-----5h7p5-|
a-0--4h5---4h5---5--2--4/5---4/5-------|
e-2-----------------3------------------|

then you are gonna play the same thing that you did in the first riff:

Riff:

e-----------------------------------------|
b-----------------------------------------|
g-----------------------------------------|
d-----------------------------------------|
a--2-2-2--2-2-2--2-2-2-2-2-2--------------|
e--3-3-3--2-2-2--0-0-0-0-0-0--------------|

Outro (same as the verses):


e-2-----------------3------------------|
b-3-----------------3------------------|
g-2-----------------0------------------|
d-0------4-----4----0------5-----5h7p5-|
a-0--4h5---4h5---5--2--4/5---4/5-------|
e-2-----------------3------------------|

and thats it. Enjoy!