Ther expression looks just like that and is working just fine =)
when i move the slider control all of the layers offset in the Z only now, which is what we wanted =)
when i posted that it was still moving in the x and z, I neglected to change the expression
for the other layers. I am using photos so I will have to add the expression to each of the layer’s position .. 300 layers of fun I tell ya!, or perhaps there is a tweak I am unaware of. /shrug
Cheers and thanks again.