How to make 2 of the same object move in front and back of eachother?

I have two green spheres. One moves up n' down and the other stays in its place. Theyre on the same Y axis. How do I make it so that the moving sphere appears in front and behind it as it moves up and down past the other?

Hey Adrianol39

if you mean the Z Order of the objects, you can do something like this:

If Sphere_1.Y < Sphere_2.Y

then Sphere_1 Move to object behind Sphere_2

else Sphere_1 Move to object in front Sphere_2

This action is listed unter 'Z Order'.