Do extension macro tubes auto focus?

I was planning on buying extension macro tubes for my NIKON D3000. The lens i will be using with the tubes is a 35mm 1.8. I was wondering if the extension tubes will auto focus or would i have to manual focus?

http://www.amazon.com/...003IVZVDO/

These are the tubes.

Sigh, read down the page, it says "auto focus" but many times when you get down to macro work manual focus is actually preferable.

When you are buying extension tube, also look for focus rail. A big help in close up photography.
More often than not you would be resorting to manual focus with the tubes.