How to illustrate moving people (or make vector animation)

programming flash
1

I must all time think about this, haw is made the vector animation on that sites:
http://www.auraent.com/
http://www.dvdomain.com.au/
http://www.bigshotmedia.com/search/lightbox/details.php?type=bs&idPhoto=10419&anchor=anchor1

Is it painted in Flash or converted video?

Can You help me to find correct answer?

Jan