Xml - flash & tween animation query?

I understand well, enough resources out there show how to output XML items. This is great.

However I really would like to introduce an animation of some kind very much like on this site.

http://www.netymology.com/

They seem to have what I think would be XML outputting news through flash, but how do they have the animation in place also.

Its remarkable and any tips and advice would be absolutely amazing, as I would like something very similar.

The actual animation itself looks nothing more than clear and blur version of arrows. But how are they combining it all.

Any advice, tips would be great.

The fact that the effect is global depending on any xml feed is ideal.

How how are they doing it???

Trev