plugins/sys/templates/admin/main_frameset.stpl
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>{execute(graphics,show_site_title)}</title>
<meta http-equiv="Content-Type" content="text/html; charset={conf('charset')}" />
</head>
<frameset cols="220,*" rows="*" border="0">
<frame src="./left_frame.php" name="nav" />
<frame src="./index.php{query_string}" name="main" />
</frameset>
<noframes>
<body bgcolor="#FFFFFF" text="#000000">
<p>Sorry, your browser doesn't seem to support frames</p>
</body>
</noframes>
</html>