パスワードを変更する PHP

<?php<br />
 session_start();<br />
 header("Content-type:text/html; charset=utf-8");<br />
 include '../config.php';<br />
 if($_SESSION['admin']=='') header('location:index.php');<br />
 $show = "display:none;";<br />
 		$sql = "SELECT * FROM `cp_admin` WHERE `id`='1'";<br />
 		$ret = mysql_query($sql);<br />
 		$row = mysql_fetch_assoc($ret);<br />
 <br />
 if($_POST){<br />
 	$admin = $_POST['admin'];<br />
 	$pass = $_POST['pass'];<br />
 	$pass1 = $_POST['pass1'];<br />
 	$pass2 = $_POST['pass2'];<br />
<br />
 	if($row['name']!=$admin && $row['pwd']!=md5($pass) && $pass1!=$pass2){<br />
 		 	echo "<script>alert('修改失败，原因：原始密码不正确，或者两次输入的密码不相同！')</script>";<br />
   	 		}else{<br />
   	 		$pass1=md5($pass1);<br />
 	$sql1 = "UPDATE `cp_admin` SET `name`='{$admin}',`pwd`='$pwd2).', WHERE `id`='1'";<br />
   		mysql_query($sql1);<br />
   		echo "<script>alert('修改成功！')</script>";<br />
   		<br />
 		echo "<script language=\"javascript\">location.href='exit.php';</script>";<br />
   		$show = "display:block;";<br />
  <br />
 	}<br />
 }<br />
 ?>