Code Textarea in Javascript

I want something like a rich-text editor for my website that is for code (should be able to do things like syntax highlight, indent on the fly, show line numbers).

I like Mozilla Bespin, but i开发者_JAVA技巧t is quite unstable right now, and has a little bit TOO much functionality for me.

Anything else out there?

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Just two days ago I learned of CodeMirror.
What are the odds?

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Something like markItUp?