Help with this very cool slide show

[relationsmith]

I have some experience with flash cs3.

I'm trying to make a slide show something like this:

http://www.bgsu.edu/flash/colleges.htm

In the slide show you will see the orange lines going around the people, on the walk path under people's feet, and at the end covering the building.

If somebody would give me an idea how to accomplish these effects it will be highly appreciated.

Thanks,

Veli

[satis]

well, I haven't played with flash for awhile, but the way I would do it is two layers, both 'higher' than the image. For anything that draw 'on top of' the person or whatever, it would just be drawn on one of those layers. The second layer would have a mask on it to cut out whatever you're going behind. By drawing a mask with the outline you can do whatever animation you want on the 'behind' layer.

There are a bunch of masking tutorials out there. I'm sure masking is how those effects were created.