CSS3 inset box shadow effect on the top portion of a container only

On this site: http://amazonia.clickbump.com/
I’m using a combination of background images and box shadow to achieve the inset shadow look just under the header area. I’d like to use css3 instead if this type of effect is possible (the key is that I need the inset shadow to only appear along the top and just about 2 inches down the sides of the “section.wrap” container element).

Anyone know how it can be done with CSS3?