index.php

<?php
session_start();
include('login.php');

?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
        "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">

<head>
        <title>untitled</title>
        <meta http-equiv="content-type" content="text/html;charset=utf-8" />
        <meta name="generator" content="Geany 0.21" />
</head>

<body>
        <form  action="login.php" method="POST">
        Username: <input type="text" name="username" id="username"> <br/>
        Password: <input type="text" name="password" id="password"> <br/>
         <input type="submit" value="Submit">
        </form>
</body>

</html>