Am very very curious as to how this was done

I hope I am not breaking protocol…
But I am very curiosu as to how something was done…
on the following site… http://www.vivaspinups.com/cms
on the left side of the page is a graphic which appears to have a flash animation playing on a background layer…
My question is how this was achieved…
Any help owuld be greatly appreciated as this is something I would like to learn to do and implement on my website, albeit with a different graphic and animation…

Thanks, and look forward to any help you can give me…
Am new to the world of Flash, so bear with me while I learn…