I'm creating a flash for my italian company website, but I
have some difficulty to create a motion tween in which I have to
apply a card rotation to let see the back of it (i.e. another
image), like an opening book. Can you help me?
you can use a loop (setInterval or onEnterFrame) to change
the _xscale of your top card movieclip from 100 to 0, swap the top
card movieclip with the back card movieclip, set its _xscale to 0
and then continue with your loop incrementing the back card
movieclip's _xscale to 100 (or -100) and/or altering its _x
property to achieve the effect you want.