The strange intro is something like this:

E -------------0--0------------
B -0--0--7-----5--5--------0---
G -4--4--4-----------6-----4---
D -----------------------------
A -----------------------------
E -----------------------------


The bass riff starts out as:

          Riff 1:

G ------||-----------------|---------------------||
D -4----||----------0------|---------------------||
A ----0-||-2--2-2-2--------|-------------------0-||
E ------||---------------0-|-2--2-2-2-3--2--0----||

The double lines means that you must repeat the riff ending and starting at
the double lines (you are not supposed to play those first two intro notes
again).  This riff (within the double lines) is repeated seven times, then
you play:
                              
G -----------------|---------------------|-----------------|
D ----------0------|-------------------0-|-2--2-2-2--------|
A -2--2-2-2--------|---------------------|---------------2-|
E ---------------0-|-2--2-2-2-3--2--0----|----------3------|

G ---------------------|-----------------|---------------------|
D -------------------0-|-2--2-2-2--------|---------------------|
A -4--4-4-4-5--4--2----|---------------2-|-4--4-4-4-5--4--2--0-|
E ---------------------|----------3------|---------------------|

You play Riff 1 again throughout the verse.  Now, this is the part that may
not be accurate:  the guitar tablature.  I am sure I am pretty close, this is
how I play the guitar part during the verse:

E ----------------------|---------------------|
B ----------------------|-2--2-2-2/3--3--3--3-|
G -4--4-4-4/7--6-6--6-x-|-3--3-3-3/4--4--4--4-|
D -4--4-4-4/7--7-7--7-x-|-4--4-4-4/5--5--5--5-|
A ----------------------|---------------------|
E ----------------------|---------------------|

If you listen to how the guitar is played, you will get the idea.  Now, this
song, believe it or not, has two choruses.  The first chorus comes after the
first verse (obviously).  The bass for it (and I am not perfect on this) is:

  Chorus 1 Bass Riff:

G ||--------------|-------------|-----------------|-----------------||
D ||--------------|-------------|-----------------|-----------------||
A ||--------------|-------------|-----------------|-----------------||
E ||-2----2--2--2-|-0--0---0--0-|-2--2-2-2-3------|-2--2-2-2-3------||

This is played four times.  It is good to slip that A note for the last time
when going back into Riff 1 for the second verse.  The guitar part for Riff 2
is:

  Guitar Riff 1A:

E ||--------------|-------------|---------------------|-------------------||
B ||-2--2--2--2---|-0-0-0--0--0-|-7--7-7-7-8\7-7-7--7-|-7--7-7-7-8\7-7-7--||
G ||-3--3--3--3---|-0---0--0--0-|-6--6-6-6-7\6-6-6--6-|-6--6-6-6-7\6-6-6--||
D ||-4--4---------|-2------2----|---------------------|-------------------||
A ||--------------|-------------|---------------------|-------------------||
E ||--------------|-------------|---------------------|-------------------||

  Guitar Riff 1B:

E --------------|-------------|----------------------|----------------------|
B -2--2--2--2---|-0---0--0--0-|-7--7-7-7-8/10-10--10-|-7--7-7-7-8/10-10--10-|
G -3--3--3--3---|-0---0--0--0-|-6--6-6-6-7/-9--9---9-|-6--6-6-6-7/-9--9---9-|
D -4--4-----4---|-2------2----|----------------------|----------------------|
A --------------|-------------|----------------------|----------------------|
E --------------|-------------|----------------------|----------------------|

You play Guitar Riff 1A three times, then you play Guitar Riff 2B once.  You
can play around a bit, especially at the F# to Em part.  The second chorus
goes something like this:

G ||--------------|-------------|-----------------|------------------------||
D ||--------------|-------------|-----------------|------------------------||
A ||-4----4--4--4-|-5--5---5--5-|-----------------|------------------------||
E ||--------------|-------------|-7--7-7-7-5------|-2--2-2-2-3-----0--2--5-||

You play this three times, and on the fourth time, you play only half of it. 
Listen to the tape or CD and you will know what I mean.  Anyway, the guitar
for that part is:

E ||-----------|------------|--------------------------|-------------------||
B ||-----------|------------|-12--12-12-12\10-10-10-10-|-7--7-7-7/10-10-10-||
G ||-6--6-6--6-|-7-7--7-7-7-|-11--11-11-11\-9--9--9--9-|-6--6-6-6/-9--9--9-||
D ||-6--6-6--6-|-7-7--7-7-7-|--------------------------|-------------------||
A ||-----------|------------|--------------------------|-------------------||
E ||-----------|------------|--------------------------|-------------------||