add error 403 site

.htaccess

+ErrorDocument 403 /core/templates/403.php
 ErrorDocument 404 /core/templates/404.php
 <IfModule mod_php5.c>
 php_value upload_max_filesize 512M

core/templates/403.php

+<?php
+if(!isset($_)){//also provide standalone error page
+	require_once '../../lib/base.php';
+	
+	$tmpl = new OC_Template( '', '403', 'guest' );
+	$tmpl->printPage();
+	exit;
+}
+?>
+<ul>
+	<li class='error'>
+		<?php echo $l->t( 'Access forbidden' ); ?><br/>
+		<p class='hint'><?php if(isset($_['file'])) echo $_['file']?></p>
+	</li>
+</ul>