I found it sometime ago and now I can\'t. I want to find something like the shopping cart at the apple store, it\'s a div thats not positioned absolute nor fixed, for instance,
May be it is helpful to you. This is new approach with css3. use position:sticky to follows the scroll.
position:sticky
Here is the article explained.
http://updates.html5rocks.com/2012/08/Stick-your-landings-position-sticky-lands-in-WebKit
and old way of doing this demo
with sticky position demo