header is not working in iframe tag of html
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Untitled Document</title>
</head>
<body>
<iframe src="blog3.php" frameborder="0" width="100%" height="600px" scrolling="yes" ></iframe>
</body>
</html>
and at blog3.php there is a an header command
<? ob_start(); ?>
header("Location: blogupf3.php");
<? ob_flush(); ?>