[scroller] I seriously want to know how to do it now

Guys, Ive been wanting to create a custom scrollber sometime now but i havent found a tutorial on it. An exact one i want to create is on: http://www.zanzinato.com/transitions.html

Could someone please tell me what are the

 to the dynamic textfield and the 

on the bar and scroller. There must be a tutorial out there that has this.