Very simple edit in place plugin for jQuery.
<!DOCTYPE html>
<html>
<head>
<title>Editable Example</title>
<script src="lib/jquery-1.9.1.min.js"></script>
<script src="lib/jquery.editable.js"></script>
<script type="text/javascript">
$(document).ready(function () {
$(".editable").editable();
$(".editable_ml").editable({
type: 'textarea'
});
});
</script>
</head>
<body>
<div class="editable"></div>
<div class="editable_ml"></div>
</body>
</html>