cookie check
-------------------
<?
// Connects to your Database
require("dbconfig.php");
//checks cookies to make sure they are logged in
if(isset($_COOKIE['ID_my_site']))
{
$username = $_COOKIE['ID_my_site'];
$pass = $_COOKIE['Key_my_site'];
$check = mysql_query("SELECT * FROM users WHERE user = '$username'")or die(mysql_error());
while($info = mysql_fetch_array( $check ))
{

//if the cookie has the wrong password, they are taken to the login page
if ($pass != $info['password'])
{ header("Location: index.php");
}

//otherwise they are shown the admin area
else
{

}
}
}
else

//if the cookie does not exist, they are taken to the login screen
{
header("Location: index.php");
}
?>

login.php
-------------------------------
<?php
require("dbconfig.php");
$un=$_POST['username'];
$pw=$_POST['password'];

$query = mysql_query("SELECT * FROM users WHERE user ='$un' AND password='$pw'",$link);
$count=mysql_num_rows($query);

// If result matched $myusername and $mypassword, table row must be 1 row

if($count==1){
	// Register $username, $password and redirect to file "login_success.php"
session_register("un");
session_register("pw");

// if login is ok then we add a cookie
$_POST['username'] = stripslashes($_POST['username']);
$hour = time() + 3600;
setcookie(ID_my_site, $_POST['username'], $hour);
setcookie(Key_my_site, $_POST['password'], $hour);

//then redirect them to the members area
header("Location: index2.php");

}else{
header("Location: index.php");

}

ob_end_flush()
?>