Flash image scrollbar determined by browser width?

Hi everybody,

I've been asked to recreate a scrolling panel in flash, very similar to the one on:

www.un.titled.co.uk

My client likes the way that whichever window width you choose, the panel re-adjusts itself. Can you see how the scrolling mechanism is somehow relative to the window width?

I guess it's done in actionscript but I can't figure out where to start. Does anybody have any way of doing this?

Many thanks,

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