I use this one: http://sourceforge.net/projects/jseditor/
WTP (web tools platform)http://www.eclipse.org/webtools/releases/0.7/whatsnew.htmlIt covers JS as well as CSS, XML, and so on.
I second on the Eclipse web tools. Been using it for a few weeks and, while it’s not bug-free (it’s in beta), it’s running pretty well.
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