How can i create this from the ground?

i downloaded this photo gallery from:
http://laco.wz.cz/tween/?page=examples

i like the way it functions but i can’t load it to my stage externaly and i can’t seem to import it from one stage to another. i’d like to create a custom version of this file from scratch but i’m seeing things in this file that i’ve yet to be exposed to.

if someone can tell me what i’m dealing with here. i’d really appreciate it.

i posted the ZIP on my server so have at it!
http://www.monkeyheadgraphics.com/down.zip

thanks in advance,
Andre
monkeyheadgraphics.com