music import iphoto for slideshow

I have a problem!

i went on holiday with friends en we had a crazy weekend, now i want to make a slideshow in Iphoto, now everything work, but now i wanted to add music! Now i can chose between to standard music or music from itunes!

Now i bought the song Hangover in Itunes ( so you can imagine what kind off weekend it was LOL ), the song is in my Itunes, but in Iphoto i can't add it in mine slideshow!

The system says i need to open Itunes??

Can anyone help me with this problem?

I speak Dutch, but the answer in English is possible thanks.

Kind Reagards

Jorrit