The blurb text is on a separate layer, which contains three different clips of text. Each paragraph fades in and out, and stays static on the scene for approximately 10 seconds - which should be long enough for the visitor to read if he or she chooses. The fade in and out effect was achieved using the alpha transparency setting, which is set to 0% when the clip is faded all the way out, and 100% when the clip is faded all the way in. Tweening allows the developer to simply create two keyframes, one with 100% alpha opacity, one with 0% alpha opacity - and then the tweening process creates all the other frames moving from 0%, 1%, 2%, 3%, etc as the animation dictates.
I found some very useful information regarding tweening here.

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