News ticker with a pause button

I successfully followed this tutorial http://www.kirupa.com/developer/mx2004/newsticker.htm

but I want to create a pause button on the side such that when the button is pressed down, the news ticker will pause. Then, when the button is pressed once again, the news ticker will start ticking again, starting FROM where it stopped when the pause button is pressed.

How do I do this?

I want everything to be still dynamically loaded from an XML file. Also, I dont mind doing it in actionscript 3 but this tutorial is in 2.0 so a direction towards the 2.0 will be great.