Is this all as tweening?

one of my favourite sites still is
I am familiar with the mx2004 tweening classes and a little with penner and laco, but I still wonder whether (amongst others) the tween in the first intro and the tween when you enter the site is totally actionscripted. What I especially mean is a square that ‘blows up’ and ‘shrinks’ in an elastic way, going from straight lines to curved lines and back.

I hope my question is clear (you take a look at he site, turn your speakers on!)