5d Mark II owners Help

I have a New 5d II and I do not like the focusing to be on the shutter button.
Having a 20D for many years I love the focusing on the back and not on the shutter button.
On the new 5d II you can use either the shutter button or the back button to focus.
When I focus with the back and then hit the shutter button the camera refocus, which I do not Like.

MY QUESTION is how do you turn off the focusing on the shutter button. I have gone over the manual several time and can not find the answer.

Unfortunately I'm at work and my 5dmkii is home, but I think the setting is at: C.Fn IV-1.

Under Cfn 4-1, set to option 2 (metering start/metering+AF start) this sets the shutter release to metering start only, and the AF-ON button to meter and AF.