qTip. Advanced tooltip plugin for jQuery, including borders and pointers created using CSS. Very flexible (we used this for the latest MP expenses application) but a little on the heavy side, weighing in at 38KB when minified.
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We've been using this at work and have really enjoyed it. It does have some trouble with positioning inside iframes, but it pretty much "just works" other than that.
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SARAHBk34 - 12th January 2010 10:11 - #