bootstrap tabs

HTML

<link rel="stylesheet" href="http://twitter.github.com/bootstrap/assets/css/bootstrap.css">
<link rel="stylesheet" href="http://twitter.github.com/bootstrap/assets/css/bootstrap-responsive.css">
<script src="http://knockoutjs.com/downloads/knockout-2.0.0.js"></script>
<div id="empty"></div>
<input type="button" name="submit-reply" class="btn btn-primary btn-medium submit-reply" value="Reply"...

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bootstrap tabs

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