ในหน้าเว็บเดียวกันเวลาล็อคอินให้มันเด้งมาหน้าเดิมและเปลี่ยนจากปุ่มล็อคอินเป็นชื่อผู้ใช้ทำอย่างไรครับ

<?php
	if($_SESSION['username']=="" && $_SESSION['password']==""){
?>
	<form action="">
		Login form
	</form>
<?php
	}else{
?>
	Detail user
<?php
	}
?>

<?php
	if($_SESSION['user']=="" && $_SESSION['pass']==""){
?>
<form id="form1" name="form1" method="POST" action="<?php echo $loginFormAction; ?>">
user
  <label for="user"></label>
  <input type="text" name="user" id="user" /> 
  pass
  <label for="pass"></label>
  <input type="password" name="pass" id="pass" />
  <input type="submit" name="submit" id="submit" value="Submit" />
</form>
<?php
	}else{
?>
	Detail user
<?php
	}
?>

<?php require_once('Connections/test.php'); ?>
<?php
if (!function_exists("GetSQLValueString")) {
function GetSQLValueString($theValue, $theType, $theDefinedValue = "", $theNotDefinedValue = "") 
{
  if (PHP_VERSION < 6) {
    $theValue = get_magic_quotes_gpc() ? stripslashes($theValue) : $theValue;
  }

  $theValue = function_exists("mysql_real_escape_string") ? mysql_real_escape_string($theValue) : mysql_escape_string($theValue);

  switch ($theType) {
    case "text":
      $theValue = ($theValue != "") ? "'" . $theValue . "'" : "NULL";
      break;    
    case "long":
    case "int":
      $theValue = ($theValue != "") ? intval($theValue) : "NULL";
      break;
    case "double":
      $theValue = ($theValue != "") ? doubleval($theValue) : "NULL";
      break;
    case "date":
      $theValue = ($theValue != "") ? "'" . $theValue . "'" : "NULL";
      break;
    case "defined":
      $theValue = ($theValue != "") ? $theDefinedValue : $theNotDefinedValue;
      break;
  }
  return $theValue;
}
}
?>
<?php
// *** Validate request to login to this site.
if (!isset($_SESSION)) {
  session_start();
}

$loginFormAction = $_SERVER['PHP_SELF'];
if (isset($_GET['accesscheck'])) {
  $_SESSION['PrevUrl'] = $_GET['accesscheck'];
}

if (isset($_POST['user'])) {
  $loginUsername=$_POST['user'];
  $password=$_POST['pass'];
  $MM_fldUserAuthorization = "";
  $MM_redirectLoginSuccess = "member.php";
  $MM_redirectLoginFailed = "index.php";
  $MM_redirecttoReferrer = false;
  mysql_select_db($database_test, $test);
  
  $LoginRS__query=sprintf("SELECT id, pass FROM member WHERE id=%s AND pass=%s",
    GetSQLValueString($loginUsername, "int"), GetSQLValueString($password, "text")); 
   
  $LoginRS = mysql_query($LoginRS__query, $test) or die(mysql_error());
  $loginFoundUser = mysql_num_rows($LoginRS);
  if ($loginFoundUser) {
     $loginStrGroup = "";
    
	if (PHP_VERSION >= 5.1) {session_regenerate_id(true);} else {session_regenerate_id();}
    //declare two session variables and assign them
    $_SESSION['MM_Username'] = $loginUsername;
    $_SESSION['MM_UserGroup'] = $loginStrGroup;	      

    if (isset($_SESSION['PrevUrl']) && false) {
      $MM_redirectLoginSuccess = $_SESSION['PrevUrl'];	
    }
    header("Location: " . $MM_redirectLoginSuccess );
  }
  else {
    header("Location: ". $MM_redirectLoginFailed );
  }
}
?>

<?php
if($_SESSION['MM_Username']=="" && $_SESSION['MM_UserGroup']==""){
?>
<form id="form1" name="form1" method="POST" action="<?php echo $loginFormAction; ?>">
user
<label for="user"></label>
<input type="text" name="user" id="user" /> 
pass
<label for="pass"></label>
<input type="password" name="pass" id="pass" />
<input type="submit" name="submit" id="submit" value="Submit" />
</form>
<?php
}else{
?>
Detail user
<?php
}
?>