CKEditor

HTML

<script src="http://ckeditor.com/apps/ckeditor/4.3/ckeditor.js"></script>
<button id="toggle" type="button">Toggle panel</button>

<div id="panel">
     <h3>Panel</h3>
    <p>This panel contains a <b>standard</b> ckeditor instance (below).</p>
    <textarea cols="80" rows="10" id="editor1">A</textarea>
</div>

CSS

#panel {
    border: 1px solid #ccc;
    margin-top: 1em;
    padding: 1em;
    display: none;
}
#editor1 {
    border: 1px solid #ddd;
    margin-top: 1em;
}

JavaScript

CKEDITOR.replace( 'editor1' );

$('#toggle').click(function () {
    $('#panel').toggle();
});