<form method="post" action="{$post}">
<input type="hidden" name="action" value="update" />
<input type="hidden" name="dir" value="{$page_obj.PID}" />
<form method="post" action="{$post}">
<input type="hidden" name="action" value="update" />
<input type="hidden" name="dir" value="{$page_obj.PID}" />