Untitled

<!DOCTYPE html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<link rel="stylesheet" type="text/css" href="style.css">
<link rel="icon" href="favicon.ico" type="image/x-icon"/>
<title>Age Of Thronez</title>
</head>
<body>
<div class="content">
  <img src="http://i.imgur.com/K58RtVF.png" style="
      width: 300px;
      margin-bottom: 2em;
      margin-top: 2em;
  ">
  <?php
 require('db.php');
 session_start();
 // If form submitted, insert values into the database.
 if (isset($_POST['username'])){
 $username = $_POST['username'];
 $password = $_POST['password'];
 $username = stripslashes($username);
 $username = mysql_real_escape_string($username);
 $password = stripslashes($password);
 $password = mysql_real_escape_string($password);
 //Checking is user existing in the database or not
 $query = "SELECT * FROM `users` WHERE username='$username' and password='".md5($password)."'";
 $result = mysql_query($query) or die(mysql_error());
 $rows = mysql_num_rows($result);
 if($rows==1){
 $_SESSION['username'] = $username;
 header("Location: index.php"); // Redirect user to index.php
 }else{
 echo "<div class='form'><h3>Username/password is incorrect.</h3><br/>Click here to <a href='login.php'>Login</a></div>";
 }
 }else{
?>
<br>
<form action="index.php" method="post" name="login">
  <input type="text" name="username" placeholder="Brukernavn" required></input><br>
  <input type="password" name="password" placeholder="Passord" required></input><br>
  <input name="submit" type="submit" value="Login" />
  </form>
  <br>
<a id="knapp" href="reg.php">Registrer deg</a>
<?php } ?>
</div>
<div id="footer">
  Copyright &copy; 2016 Age Of Thronez &copy; All rights reserved<br>
<a href="vilkar.php">Vilkår og betingelser</b>
</div>
</body>