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 (022100@1)| --------------------------------|
B (x2444x@1)| --------------------------------|
G| (320003@1)---4----------------------------|
D (xx0232@1)| ---4-------4------2-------------|  2x (let the chords ring)
A (x02220@1)| ---2-------4------2-------------|
E (022100@1)| -----------2------0-------------|

B (x2444x@1)     F# (244322@1)   E (022100@1)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 (x2444x@1)       E (022100@1)      B (x2444x@1)       E (022100@1)     G# (xx1114@1)      E (022100@1)   G# (xx1114@1)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 (022100@1)Chorus:

(strumming pattern: D D DUD | U UD DUDU  | D D DUD  |  U DU DUDU )
E (022100@1)| ----------------------------------------------------|
B (x2444x@1)| ----------------------------------------------------|
G| (320003@1)---4------------------------------------------------|
D (xx0232@1)| ---4-5x-----2---------6----------4------------------|	2x
A (x02220@1)| ---2--------2-7x------6-5x-------4--7x--------------|
E (022100@1)| ------------0---------4----------2------------------|

B (x2444x@1)         E (022100@1)       G# (xx1114@1)       F# (244322@1)



"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 (022100@1)| ---------------------------------------------------------|
B (x2444x@1)| ---------------------------------------------------------|
G| (320003@1)---4-----------------------------------------------------|
D (xx0232@1)| ---4--------2----------6----------4----------------------|  2x
A (x02220@1)| ---2--------2----------6----------4----------------------|
E (022100@1)| ------------0----------4----------2----------------------|

B (x2444x@1)         E (022100@1)        G# (xx1114@1)       F# (244322@1)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 (x2444x@1)         E (022100@1)      B (x2444x@1)       E (022100@1)      B (x2444x@1)     E (022100@1)(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 (022100@1)| ------------------------------------------------------|
B (x2444x@1)| ------------------------------------------------------|
G| (320003@1)------------------------------------------------------|
D (xx0232@1)| ---6----------4---------------------------------------|
A (x02220@1)| ---6-5x-------4-7x------------------------------------|
E (022100@1)| ---4----------2---------------------------------------|

G# (xx1114@1)       F# (244322@1)Then into the Chorus (played 3x)
After that play again the Opening = Ending (let the last chord ring out)

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Lead guitar: (standard tuning)
Opening:

E|---------------------------------------------11------------| (022100@1)B|----12----12-11----11-12-----12--14------14--------14------| (x2444x@1)G|-------11-------11--------11----------11--------11----11---| (320003@1) 4x
D|-----------------------------------------------------------| (xx0232@1)A|-----------------------------------------------------------| (x02220@1)E|-----------------------------------------------------------| (022100@1)
When the rhythm hits the G# powerchord in the Verse, the lead guitar does something like this:

E (022100@1)| ----7-7-7-7---9-9-9-9-----              --7-7-7-7-7-----|
B (x2444x@1)| -----7-7-7-7---7-7-7-7----