Yes, I thought about that already... I see two possibilities: find a place that provides an animated image (for ex. an animated gif image), or store the last ten images (but usually sites like yahoo provides only one per hour) and "play" the sequence when the dialog is shown... But then you'd need to wait for several hours to build a usable sequence...
The first method is probably better, I still should find a good site that provides animated images... If you happen to find such a site, let me know!
Cheers
Yorik