Here are the tabs I use to play that song.
My cover can be seen on youtube:
http://www.youtube.com/watch?v=Y4lZ7i_kNSU
Enjoy!!

Rhythm guitar: (standard tuning)
Opening

E 	| --------------------------------|
B 	| --------------------------------|
G	| ---4----------------------------|
D 	| ---4-------4------2-------------|  2x (let the chords ring)
A 	| ---2-------4------2-------------|
E 	| -----------2------0-------------|

         B       F#     E

Verse:

    PM---------------------------------------------------------------|
E     | -------------------------------------------------------------|
B     | -------------------------------------------------------------|
G     | ---4---------------4-----------------------------------------|
D     | ---4-16x--2--------4--16x----2--------6--------2-----6-------|
A     | ---2------2-16x----2---------2--16x---6--16x---2-16x-6--16x--|
E     | ----------0------------------0--------4--------0-----4-------|

	     B	        E        B         E       G#        E     G#

    PM---------|   |----|   |------------|
E     | -------|---|----|---|---|--------|
B     | -------|---|----|---|---|--------|
G     | -------|---|----|---|---|--------|
D     | ---2-2---2---2-2---2---2---2-2---|    mute the last chord right
A     | ---2-2---2---2-2---2---2---2-2---|    after you played it open
E     | ---0-0---0---0-0---0---0---0-0---|

	     E

Chorus:

	(strumming pattern: D D DUD | U UD DUDU  | D D DUD  |  U DU DUDU )
E 	| ----------------------------------------------------|
B 	| ----------------------------------------------------|
G	| ---4------------------------------------------------|
D 	| ---4-5x-----2---------6----------4------------------|	2x
A 	| ---2--------2-7x------6-5x-------4--7x--------------|
E 	| ------------0---------4----------2------------------|

	     B	          E         G#         F#






"heart, heart,.."

(add a palm muting structure in there, figure it out by listening to the song carefully, 
or watch my cover at  http://www.youtube.com/watch?v=Y4lZ7i_kNSU )

E 	| ---------------------------------------------------------|
B 	| ---------------------------------------------------------|
G	| ---4-----------------------------------------------------|
D 	| ---4--------2----------6----------4----------------------|  2x
A 	| ---2--------2----------6----------4----------------------|
E 	| ------------0----------4----------2----------------------|

	     B	          E          G#         F#

After that play the Opening,
Then the Verse, and again the Chorus

end the second chorus with one more F# powerchord and let it ring out completely (2:06)

"I miss you so bad, ..."

    PM-------------------------------------------------------------|
E     | -----------------------------------------------------------|
B     | -----------------------------------------------------------|
G     | ---4------------------4------------------4-----------------|
D     | ---4-16x-----2--------4--16x----2--------4--16x--2---------|
A     | ---2---------2-16x----2---------2--16x---2-------2--16x----|
E  | -------------0------------------0----------------0------------|

	     B	          E        B         E        B       E

(on the last E powerchord lift up your palm slowly, to increase the volume, and play the 
very last strum completely open. Mute it afterwards !!

"Going out of my head..."

I like to slide down my left hand right into the G# powerchord, at this point:

	(strumming pattern: D D DUD | U UD DUDU )
E 	| ------------------------------------------------------|
B 	| ------------------------------------------------------|
G	| ------------------------------------------------------|
D 	| ---6----------4---------------------------------------|
A 	| ---6-5x-------4-7x------------------------------------|
E 	| ---4----------2---------------------------------------|

	       G#	        F#

Then into the Chorus (played 3x)
After that play again the Opening = Ending (let the last chord ring out)

________________________________________________________________________
________________________________________________________________________

Lead guitar: (standard tuning)
Opening:

E	|---------------------------------------------11------------|
B	|----12----12-11----11-12-----12--14------14--------14------|
G	|-------11-------11--------11----------11--------11----11---|  4x
D	|-----------------------------------------------------------|
A	|-----------------------------------------------------------|
E	|-----------------------------------------------------------|


When the rhythm hits the G# powerchord in the Verse, the lead guitar does something like this:

E 	| ----7-7-7-7---9-9-9-9-----              --7-7-7-7-7-----|
B 	| -----7-7-7-7---7-7-7-7----