I still despize Flash's handling of external file types. The faulty reporting of dimensions (height/width, etc) is just inexcusable.
The .swf runs an interval check, and when the height and width return something other than zero, it repositions the image. The problem? Occasionally it will hang onto the dimensions of the old image, even though it's been swapped out.
Just bogus, really.
There's a clip that contains several squares. Using the Penner Easing Equations, when you mouse over a button on the right, the boxes tween into place. When you mouse out, the boxes go out. It's that simple, really.
I saw an example of something like this online this morning and thought "that's got to be easy…"