ทำระบบ Login และทำ SESSION จำ Status แต่มันไม่จำค่า

Quote:

<?php session_start(); ?>

<?php

if( !isset($_POST['txtUsername']))
{
echo "<script>window.location = 'login.php'</script>";
exit();
}

$username = $_POST['txtUsername'];
$password = md5($_POST['txtPassword']);

include('connect.php');

$sql = "select * from users where User_name = '$username' and Password = '$password'";
$query = mysql_query($sql) or die(mysql_error());
$rows = mysql_num_rows($query);
if($rows)
{
echo "<script>alert('Username and Password Incorrect!');history.back();</script>";
exit();
}
else
{
$data = mysql_fetch_array($query);
if($data['Status'] == "User")
{
$_SESSION['status']="User";
}
else if ($data['Status'] == "Admin")
{
$_SESSION['status']="Admin";
}

$_SESSION['login'] = strtolower($username);

echo "<script>alert('Login completed');window.location = 'search.php';</script>";
}

?>