$def with (text='', prev='')

<div id="preview">$:prev</div>

<p>
Use <a href="http://daringfireball.net/projects/markdown/syntax">markdown</a> syntax.
</p>

<p>
You can use webpy <a href="http://webpy.org/docs/0.3/templetor">templetor</a> putting as first line #templetor
</p>

<form method="POST" action="">
    <textarea rows="20" name="newpage">$text</textarea>
    <button type="submit" name="button" value="save">Save</button>
    <button type="submit" name="button" value="prev">Preview</button>
</form>