This song appears to be really simple and according to my tab it is. Most of the song relies on one riff and it can be done loads of ways. This is probably the easiest, simplest and best.
[ Tab from: http://www.guitartabs.cc/tabs/a/a/nothing_tab_ver_4.html ]
It repeats till the verse then stops and then comes back in for chorus. I just heard it on the radio so don't treat it as gospel. I'll change it later and I'm sure other people will modify it.