Untitled

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title></title>
    </head>
    <body>
        <?php

        Session_start();

        $passwords = array("nate" => "letmein",
                           "alaxic" => "thisisme");

        if (!$_POST["username"] or !$_POST["password"]) {
            echo "You must enter your username and password";
            exit;
        }
        if ($_POST["password"] == $passwords[$_POST["username"]]) {
            echo "Login successful!";
            $_SESSION["auth_username"] = $_POST["username"];
        }
        else {
            echo "Login incorrect. Please try again.";
        }
        ?>
        <FORM ACTION="login.php" METHOD="POST">
            <TABLE BORDER=0>
               <TR>
                   <TD>Username:</TD>
                   <TD><INPUT TYPE="TEXT" SIZE=10 NAME="username"></TD>
               </TR>
               <TR>
                   <TD>Password:</TD>
                   <TD><INPUT TYPE="PASSWORD" SIZE=10 NAME="password"></TD>
               </TR>
            </TABLE>
            <INPUT TYPE=SUBMIT VALUE="Log in">
        </FORM>
    </body>
</html>