Comment on WordPress AdSense Themes by Rachel.

Google AdSense Ads Hi David,
I would like to ask a CSS question. I’d want to float down the left sidebar (move it) while the visitor scrolls down the page for making him see the left adverts while scrolling the post.

It could be one of the followings on the sidebarbox , but I’m not sure:
position: fixed bottom: 10px;
or position: relative bottom: 10px;
or something similar.
Any suggestions?