How to do something similar?

[maslo]

I would like to know what is the way of doing following effect
I want a piece of text to be slowly (or quickly) written on the screen after one visits my webpage.
I was inspired by following page
http://today.reuters.com/news/home.aspx
have look at that text effect which is placed just under the search field (Latest news)

[Vege]

http://today.reuters.com/News/NewsTicker.aspx

it's done in javascript and when you view the source it should be pretty straight forward.
EDIT: And the
http://i.today.reuters.com/script/ticker.js
is pretty uberly commented.

[maslo]

Would somebody be so kind to help me to do something similar bbut less complicated? Frankly I am not very familiar with javascript and thats why i dont have a foggiest idea how tto do it. Thanks