Transparance ?!

Transparant pop up

I came a cross a nice promothing, the pop up is tear the
hole in the website, and thats without a plugin ( no need to download )

I have the IcePlayer, but the reader needs to download a player before they can se it.

This pop up don´t need that, the question is how they do that ???

It´s Flash ofcource…

Take a look at the picture, sorry no link to show you in real, the
promothing ends last week a think