iPad2 to home cinema

[DICKYBIRD]

Hi, I've recently purchased an iPad2 and a simple charging only dock (no speakers etc). On the back of the dock is a line out for a normal headphone jack. What I want to know is this - is there any way of connecting the iPad dock to my surround sound system so I can listen to the music through this? I have a Sony STR-KS360S.
Thanks for any help offered,
Richard.