Link on body background image

I am trying to create one advert that use both empty sides of the website content. So i add the advert image as a background on BODY tag. look nice. But the problem is to add a link to it. I start with onclick att on body, but them all site content become clickable. Also i try to use different z-index for body and the content div. Don;t work as well.

This the w开发者_开发问答ebsite i take the idea from. I just want to do some thing similar. http://www.sport.co.uk/

Any help are welcome.

I would forget about the body background and use 3 div columns.

Other possibility would be to use absolute positioning in css and for new browsers you can make the div to stay on its position and not to scroll.