There are several ways to do this. The easiest one I have found is Fireworks, it has an option to select all 30 PNG files and load them into different layers - then export as an animated gif. I'm sure that Photoshop, Corel Photo Paint, PaintShop Pro, etc can perform similar tasks. There are also a few dedicated "Animated Gif" programs out there, you can search at ZDnet.com/downloads, or download.com.
Have fun
Art
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