How to automatic scroll up and down went open the page...?

I need some help how to create page automatic scroll up and down by itself. Example for the situation is:

When a user opens the page it will scroll up and down automatically and play by itself without scroll using a mou开发者_运维技巧se.

I found this article http://www.javascriptkit.com/javatutors/advwin3.shtml which gives explicit examples on how to programmatically scroll the browser window using javascript.

Another StackOverflow post shows an example of a scrolling script in conjunction with a timer: javascript timer page up and down won't go to bottom of page