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Originally posted by scraze
The question you're posing has passed through my mind once as well, but I never looked for the answer (lazy banana, I know). After playing with post previews for a bit, it appears that the atsimg tag does not provide a slider, while the img tag will. The img tag expands for trusted hosts (e.g. imageshack, media.abovetopsecret.com), with a nice slider for all to enjoy. For the ATS-style link instead of an embedded image, you can use the im tag (no g).
The atsimg tag seems to be deprecated! At least I can't locate it in the post toolbar anymore.
Here's a related thread: No scrollbar with [atsimg] tag
Judging by the comments in the thread, we've just not been paying attention...
[edit on 7-4-2010 by scraze]