There are a few different ways to do the resizing, and they do have pros and cons. I have seen some different plug-ins for the 3.X series, and have considered them in the past, but haven't done much testing on what they might break. I would want it to be seamless, and have no effect on images that are below the size that would require resizing, and I would want it to work on most browsers that people use to visit here; some of the tools only work well on the very latest browser versions.
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