Animated Gifs can be transparent too!

set up your animation... in layers
like a flip book

slice where you want animation ( Animated Gif)

and where you want detail (Jpeg)

Go to ImageReady

in Image ready, use the image slice tool to select the slice for your animation.

use the animation palette to turn on successive layers to create animation.

change speed when needed

 

 

use optimize to animation to gif, and other to jpeg.

save optimized with html

it will come up like this Being web page.

Note that the gif is transparent!

You can also put it in Layers and move it around...