Really cool JS tools: does anybody know what this is?

Very cool JS components: http://www.msnbc.msn.com/id/40664031/ns/us_news-crime_and_courts/

Check out the icons next to the vertical scrollbar in your browser, and the expa开发者_开发问答nding 'sharing' toolbar at the bottom.

Does anybody know if these are publicly available components? Has anybody seen these before?

Edit: I'm talking about:

1. The way the sections in the bottom bar expand into tabs to show more controls. Try clicking on "Login and settings", for example.
2. The way the links near the scrollbar take you to the respective sections. Very cool tool to aid user discovery in a long page.

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I was intrigued by the scroll markers used for jumping around the page so I made a start at replicating the functionality in a plugin:

https://github.com/sj26/jquery.scrollmarkers

It's definitely not pretty yet, but it's a start.

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Its a private library built by Krux Digital, Inc.

I dug into the source of http://cdn.krxd.net/krux.js

Its ajax tabs..

Also, you can have a bar fixed at bottom of page simply by using

position:fixed 

property in css, then in the div at bottom, impliment jQuery.tabs, and for each tab load data via ajax. Wont be that difficult. and if MSN has implemented it, they would have surely spent a lot of time on it