Need Script/Technique To Make Content Scroll Down the Page

Many sites use this to keep ads always in front when visitors scroll down

[notsosmart]

I want to implement a script on some pages that keeps a chunk of content always visible on the right side as the visitors scrolls down reading the main content.

How do I repeat this? I want to put some navigational tools and additional elements always in front of a user (I have a lot of pages with long content, so I could really use that).

Ideas?

[edited by: phranque at 6:30 am (utc) on Dec. 1, 2009]
[edit reason] No urls, please. See TOS [webmasterworld.com] [/edit]

[phranque]

this WebmasterWorld search for "position fixed div [google.com]" should give you some ideas to get started.