ช่วยดูโค้ด save ตัวนี้ให้ผมหน่อยครับ รีบมากคับ รบกวนด้วยนะครับ !!

<?	
session_start();
include ("connect.php");
?>
<meta http-equiv="Content-Type" content="text/html; charset=tis-620" />
<?
function show_msg($msg)
	{
	echo'<script language="Javascript">';
	echo"alert('".$msg."')";
	echo'</script>';
	}
if($_REQUEST["button"]) {	
		if($_POST["code"] != $_SESSION["security_number"]) {
					 unset( $_SESSION['security_number']);
					 echo "<script type=\"text/javascript\">alert(\"»é͹¼ÅÅѾ¸ìäÁè¶Ù¡µéͧ\");history.back();</script>";
					 exit();
				}

			$_SESSION["Cus_Name"]= $_REQUEST['Cus_Name'];
			$_SESSION["Cus_Idcard"]= $_REQUEST['Cus_Idcard'];
			$_SESSION["Cus_BirthDay"] = $_REQUEST['Cus_BirthDay'];
			$_SESSION["Cus_User"]= $_REQUEST['Cus_User'];
			$_SESSION["Cus_Pass"]= $_REQUEST['Cus_Pass'];
			$_SESSION["Cus_Phone"]= $_REQUEST['Cus_Phone'];
			$_SESSION["Cus_Add"]= $_REQUEST['Cus_Add'];
			$_SESSION["Cus_Country"]= $_REQUEST['Cus_Country'];
			$_SESSION["Cus_Mail"]=$_REQUEST['Cus_Mail'];
			
			$sql1 = "SELECT * FROM tbl_customer where Cus_Idcard ='".$_REQUEST['Cus_Idcard']."'";
				$query = mysql_query($sql1);
				
				$num = mysql_num_rows($query);
				
				if($num >= 1){
				echo '<script type="text/javascript">alert("This ID Card is already Taken, please register");history.back(-1);</script>';
			exit();
				}
				
			$sql2 = "SELECT * FROM tbl_customer where Cus_User ='".$_REQUEST['Cus_User']."'";
				$query = mysql_query($sql2);
				
				$num = mysql_num_rows($query);
				
				if($num >= 1){
				echo '<script type="text/javascript">alert("This User is already Taken, please register");history.back(-1);</script>';
			exit();
				}
			
			$sql3="SELECT count(Cus_Mail) as xemail FROM `tbl_customer` WHERE Cus_Mail ='".$_SESSION["Cus_Mail"]."' ";
			$rows=mysql_query($sql3) or die(mysql_error());
			$result1=mysql_fetch_assoc($rows);
			if($result1["xemail"]>=1){
			echo '<script type="text/javascript">alert("This Email is already taken, please register.");history.back(-1);</script>';
			exit();
			}
	
		$sql="INSERT INTO tbl_customer(Cus_Name,Cus_idcard,Cus_BirthDay, Cus_User,Cus_Pass,Cus_Phone,Cus_Add,Cus_Country,Cus_Mail) VALUES('".$_SESSION["Cus_Name"]."' ,'".$_SESSION["Cus_Idcard"]."' ,'".$_SESSION["Cus_BirthDay"]."','".$_SESSION["Cus_User"]."', '".$_SESSION["Cus_Pass"]."','".$_SESSION["Cus_Phone"]."','".$_SESSION["Cus_Add"]."', '".$_SESSION["Cus_Country"]."','".$_SESSION["Cus_Mail"]."')";
		$result = mysql_query($sql) or die(mysql_error());
		
		
		
	show_msg("Register Complete");
	echo "<meta http-equiv='refresh' content='0;URL=http://localhost/project/register_customer.php'>";				
		
}else{
		show_msg("Error Try Again !!");	
		echo "<meta http-equiv='' content='0;URL=http://localhost/project/register_customer.php'>";
}
?>