COOL fade in effect!

If you go to the following site and look at the “Learn about the new InDesign CS2” box, there is a FADE in effect that happens. You may want to refresh couple of times to see how it looks.

http://www.adobe.com/products/indesign/

My question is…>HOW DO YOU DO THAT?

Is it a 3rd party program or can flash actually do those type of fade or masking effects?

Let me know…pleeeaseee…it’s SO COOL!!!