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thanks for sharing!
You’re welcome.
One of the things you didn’t point out to your readers is that both gif and png support transparency where tiff and jpg do not. This means that if you have an image that is partially transparent, gif and png will preserve that (to a certain extent) where jpg and tiff will convert the transparency to a background color.
That is true. Both GIF and PNG support transparency. For those using IE6, however, the PNG transparency won’t work properly, at least from what I have seen.