Totally with PixieSteve. The C chord should be played on sky and Am should be played as the link between the two lines. I think you've got a better ear than you think. Sublime song though
to be honest i was being overly modest when i posted that. it was obvious it was in the wrong place. i just wanted to sound unsure so that if by some chance i was wrong, i wouldn't have to make any excuses ;)