Extending/Modifying Kirupa's Dynamic Text Scroll Box

Hi all,

I’ve ran through and can understand Kirupa’s tutorial

Scrolling Dynamically Loaded Text
http://www.kirupa.com/developer/mx/dynamic_scroller.htm

My question is how do I go about modifying it so that when I drag the scrollthumb there is a bit of delay and slingyness in the movement of the text. So that is slowly slides into place?

I am trying to replicate the feeling of the scrollbar at this site:
http://www.markesephotography.com/index_flash.html

If anyone can show me how to change Kirupa’s tutorial to produce this effect I would be very grateful.

Any help would be much appreciated