first tab here, i think its drop D tuning.
(intro with some effect er something)
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----------------------------------| (x2)
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--------6-66-66-66-6-6666---------|
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[ Tab from: http://www.guitaretab.com/g/godsmack/134252.html ]
(intro thing cont./ verse)
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-------0--0--3-3-3-3---333-xx-5-5-555-666-5-------|
-------0--0--3-3-3-3---333-xx-5-5-555-666-5-------|
put some variations into the verse thing, but that sounds like the right to me