In the song iris by the goo goo dolls what is the little guittar played in the beggining?

its like a very high pitched sounding guitar

you can see it at about 29 seconds into this video

http://youtube.com/watch?v=Eu2b8Jn5jLQ

In the song iris by the goo goo dolls what is the little guittar played in the beggining?
Mandolin : )