The tab has no timing on it, so listen to the song for it.
intro
|--------------------------
|--------------------------
|--------------------------
|-7--7-5--5-4--4-3--3-7--7-    there may be a few muted
|-7--7-5--5-4--4-3--3-7--7-    strums inbetween chord
|-5--5-3--3-2--2-1--1-5--5-    changes.
main riff 
|----------------------------
|----------------------------
|-------------5--5--7--7-----
|-7--7--5--5--5--5--7--7--7--
|-7--7--5--5--3--3--5--5--7--
|-5--5--3--3--------------5--
throughout song, basically, from what I can tell, just pick at the chords in the 
main riff or the intro chords, playing bass notes mostly and mayb strum a couple.

this is played near the middle/end of the song after the main riff has been played twice
|---------------------------------------------------------
|---------------------------------------------------------
|-7-7-7-7-7-7-7-7-x---------------------7-7-7-7-7-7-7-7-x-
|-7-7-7-7-7-7-7-7-x-7-7-7-7-x-7-7-7-7-x-7-7-7-7-7-7-7-7-x-
|-5-5-5-5-5-5-5-5-x-7-7-7-7-x-7-7-7-7-x-5-5-5-5-5-5-5-5-x-
|-------------------5-5-5-5-x-5-5-5-5-x-------------------
|-----------------
|-----------------
|-----------------
|-5-5-5-5-5-5-5-5-
|-5-5-5-5-5-5-5-5-
|-3-3-3-3-3-3-3-3-
then after play the intro riff again
ok, they're the main parts of the song, quite simple to remember them.
e-mail corrections to im_starting_2_like_th@barmaid.co.uk