php มันขึ้นแบบนี้อะคับบ แก้ยังไงอะ CREATE TABLE `member` ( `id` int(11) NOT NULL auto_increment,

<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<?
include ("connect.php");
$username =$_POST['username'];
$password =$_POST['password'];
$confirm  =$_POST['confirm'];
$name     =$_POST['name'];
$lastname =$_POST['lastname'];
$gender =$_POST['gender'];
$day =$_POST['day'];
$month =$_POST['month'];
$year =$_POST['year'];
$address =$_POST['address'];
$email =$_POST['email'];

if(empty($username)||empty($password)||empty($confirm)||empty($name)||empty($lastname))
{
echo"<script>alert('กรอกข้อมูลไม่ครบครับ!!!');history.back();</script>";
exit();
}
if($password !=$confirm)
{
echo"<script>alert('Please check password!!!');history.back();</script>";
exit();
}
if(!checkdate($month,$day,$year))
{
echo"<script>alert('Please check Birthday!!!');history.back();</script>";
exit();
}
$sqlC="select * from member where username='$username'";
$queryC=mysql_query($sqlC) or die("error=$sqlC");
$numC=mysql_num_rows($queryC);
if($numC !=0)
{
echo"<script>alert('Please change USERNAME!!!');history.back();</script>";
exit();
}else
{
$birthday ="$year-$month-$day";
$password =base64_encode($password);
$sql="insert into member values('','$username','$password','$name','$lastname','$gender','$birthday','$address','$email')";
mysql_query($sql) or die("error=$sql");
echo "<script>alert(' ++ Complete ++ ');window.location='index.php';</script>";
}
?>