probably they mean this:
Flash version: make the banners using Macromedia Flash. Creates nice fluid animations and still small size. Files are saved in SWF instead of animated GIF or JPGs. You need to use an OBJECT or an EMBED tag to se them, or both of them, instead of just an IMG tag
The size I want: the banners are small enough, and load fast, so no re-design on flash is required. Usually a banner is made in flash when you try to make it in animated gif, and the final file is way too big
...it's my opinion, but I think that's what they mean
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