Both MacroMedia menu and the Dynamic Drive menu use javascript, which means, unfortunately, that they do not work if javascript is turned off, which is the case more often than you might think (think corporate network.) Son of Suckerfish can use the csshover.htc script, which, though it's a javascript, is a proprietary format that will work in IE even with javascript turned off. And the other browsers don't need it and don't see it.
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