Parse error: syntax error, unexpected T_ELSE in login.php [on hold]

Can anyone check my code? i have try to change my code many times, but iam not sure whats wrong. Please, help me out of this error. I am getting this error:

Parse error: syntax error, unexpected T_VARIABLE login.php on line 33

Here is my code:


   <?php
   session_start();
   ?>

  <?php require_once("includes/connection.php"); ?>
  <?php include("includes/header.php"); ?>

  <?php

   if(isset($_SESSION["session_username"])){
     // echo "Session is set"; // for testing purposes
     header("Location: intropage.php");
   }

     if(isset($_POST["login"])){

     if(!empty($_POST['username'])&&!empty($_POST['password'])) {
      $username=$_POST['username'];
      $password=$_POST['password'];
$query =mysql_query("SELECT * FROM userlist WHERE username='".$username."' AND password='".$password."'");

  $numrows=mysql_num_rows($query);
 if($numrows!=0)

  {
  while($row=mysql_fetch_assoc($query))
  {
  $dbusername=$row['username'];
  $dbpassword=$row['password'];
  }

  if($username == $dbusername  $password == $dbpassword)

   {

   // old placement
   //   session_start();
   $_SESSION['session_username']=$username;

   /* Redirect browser */
   header("Location: intropage.php");
   }
   } else {
   //   $message = "Invalid username or password!";

   echo  "Invalid username or password!";
   }

   } else {
   $message = "All fields are required!";
   }
   }
   ?>