php求教[已解决]

<?
$pwd='123456';
if($_POST['pwd'] == $pwd || isset($_COOLIE['pwd'])){
setcookie("pwd", "mm", time()+3600);
echo '密码正确<a href="hyl.top8.com/tool/ck.php">点击刷新</a>';
}elseif($_POST['submit']){
echo '请不要非法闯入';
}else{
echo '<form action="ad.php" method="POST">密码:<input type="text" name="pwd"><br><input type="submit" name="submit" value="提交"></from>';
}
?>