At The Drive-In - 198d Bass

This has got to be probably my favorite song. =)

Play these two riffs alternating for most of the song:
G:-----------------------
D:--------------4--------
A:---7-5-7-5-2-----2-2---
E:-0-------------------3-

G:-------------------
D:------------4------
A:---7-5h7p5-2-2--2--
E:-0----------------3

im still unsure but i think the first riff variates to this:
G:----------------------
D:---------4----4-------
A:---7-5-7---2-----2-2--
E:-0-------------------3

During the quiet part the bass comes in after about 2 bars with:
G:--------------------
D:--------------------
A:--------------------
E:--7---7\5---5---3r--

woo yay! play it properly or you'll ruin such a perfect song.