ขอคำแนะนำ login เสร็จแล้วอยากให้แสดงชื่อผู้ใช้ แทนตอนนี้ที่เป็นชื่อ user

<?php
    session_start();


	if(isset($_POST["usr"]))
	{	include "config.php";
		$conn = mysql_connect($host,$usr,$pass) or die("can't connect db");
		mysql_query("SET NAMES UTF8");	
		mysql_select_db($db);

		$user = $_POST["usr"];
		$password = $_POST["pass"];

		$command = " SELECT * FROM user WHERE user = '$user' and password = '$password'";
		$qr 	 = mysql_query($command,$conn);
		$num_row = mysql_num_rows($qr);

		if ($num_row>0){
			// ok
		$f_data=mysql_fetch_array($command);
    $user=$f_data["usr"]; 
    $pass=$f_data["pass"];
    $_SESSION['login'] = $_POST['usr'];
    

    echo "<script>location.href='index.php';</script>";  

		}

    else
  {
  echo "<script>alert('User or Password not valid');history.back();</script>";
  }
	
	}
?>	



หน้า index
<?
session_start();
if($_SESSION['login'] !="")
{
echo "Welcome : ".$_SESSION['login'];  
}
else
{
echo "<script>alert('Please Login');location.href='login.php';</script>";
}
?>