MULTIPLE SOUND (fade-in/fade-out)

Hi guys,

I have this problem. I would like to have background track playing on a flash-site. And when you click to load in en external page I would like another track to fade-in to “join” or “add” to the previously existing track with, lets say a little guitar flicks. And of course, fade-out when you change page…

How would I go about to do this?? Anyone?? :-/

/Dexner