Linking CC sphere to camera motion

lookAt(thisComp.activeCamera.position, position)[0]

lookAt(thisComp.activeCamera.position, position)[1]

lookAt(thisComp.activeCamera.position, position)[2]

Okay, please bear with me here. I'm (clearly) not an expressions guy, but I need to get this done asap.

I have a comp where I'm using CC sphere to "be" inside a spherical background. I want the background to move when the camera moves.

I posted to the adobe forums, and I got back a reference to a YouTube movie

http://www.adobeforums.com/webx/.59b77e3d/1

That script got me half way there.

My camera is parented to a null which is animated. The camera actually has no keyframes or expressions applied to it.

The current expression is applied to the CCsphere X Y and Z rotation attributes and links to the camera position:

lookAt(thisComp.activeCamera.position, position)[0]
lookAt(thisComp.activeCamera.position, position)[1]
lookAt(thisComp.activeCamera.position, position)[2]

This is great, but I need it to be linked to the rotation of the camera's null, not the position of the camera. I'm trying to figure this out with no success. Any ideas?

Thanks

----------S