ทำยังไงให้ค่าที่ส่งมาอยู่ในช่อง textbox หน้าล็อกอิน

<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
session_start();
<?php
mysql_query("SET NAMES UTF8");

	$name = $_SESSION['login'];
	echo"<center><h3>Welcome user : <input type="text" value="<?php echo $name; ?>" /></h3><br>";


?>

<meta http-equiv="Content-Type" content="text/html; charset=utf-8">

<?php

if(empty($_POST['username']) || empty($_POST['password'])){
	echo"<b>Fill All Detail </b>";
	exit;
}
else{
	$username=$_POST['username'];
	$password=$_POST['password'];
	$customer_name=$_POST['customer_name'];
		$conn=mysql_connect("localhost","root","mysql") or die("could not connect");
	mysql_select_db("project") or die ("could not select database");
	mysql_query("SET NAMES UTF8");
	$query="select * from customer where username='$username' and password='$password' " ;
	$result = mysql_query($query);

	while($row = mysql_fetch_array($result)) {
     $customer_name = $row["customer_name"];
	}



	$result=mysql_query($query) or die(mysql_error());
    $count=mysql_num_rows($result);
	if($count==1){
		echo"<b> $customer_name login successfully</b><br>";
		
		$_SESSION['login']= $username;
		$_SESSION['password']= $password;
		$_SESSION['customer_name'] = $customer_name;	 
		echo"SET Cookie to login:$username,password:$password<br>";
		echo"<a href=\"s_user.php\">User detail</a><br>";
		echo"<a href =\"s_logout.php\">Logout</a>";
	}
	else{
		echo"<b>User $username Authentication Failed<b><br>";
		echo"<a href=\"index.php\">login again</a>";
	}
}
		?>

<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
session_start();
<?php
session_start();
mysql_query("SET NAMES UTF8");
$customer_name = $_SESSION['customer_name'];
echo"<center><h3>Welcome user : <input type=\"text\" value=\"" . $customer_name ."\" /></h3><br>";

?>

<?php
    session_start();
?>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<?php
session_start();
mysql_query("SET NAMES UTF8");
$customer_name = $_SESSION['customer_name'];
echo"<center><h3>Welcome user : <input type=\"text\" value=\"" . $customer_name ."\" /></h3><br>";

?>

echo $customer_name = $_SESSION['customer_name']; //ดูว่าเป็นชื่อที่ต้องการหรือยัง