//Change the DO_LOGIN Module in your modules.php to:

<!-- DO_LOGIN-->
<div id="do_login">
<?php

if(isset($_POST['login_submit'])) {
    if(isset($_POST["user"]) && isset($_POST["pw"])) {

        $user = $_POST["user"];
        $pw = $_POST["pw"];

        $connection = mysql_connect($mysqlhost, $mysqluser, $mysqlpw) or die ($db_error);
        mysql_select_db($mysqldb, $connection) or die($db_error);

        $a=mysql_query("SELECT password FROM authme where username = '$user'");
        if(mysql_num_rows($a) == 1 ) {
            $password_info=mysql_fetch_array($a);
            $sha_info = explode("$",$password_info[0]);
        } else {
            echo '<div class="alert alert-error"><center>Du bist nicht registriert<meta http-equiv="refresh" content="2; URL=index.php"></center></div>';
        }

        if( $sha_info[1] === "SHA" ) {
            $salt = $sha_info[2];
            $sha256_password = hash('sha256', $pw);
            $sha256_password .= $sha_info[2];;
            if(strcasecmp(trim($sha_info[3]),hash('sha256', $sha256_password) ) == 0 ) {
                $_SESSION['User'] = $user;
                ini_set("session.cookie_lifetime","7200"); //set session timeout to 2h

                if($_SESSION['User']) {
                    echo '<div class="alert alert-success"><center>'.$login_success.'<meta http-equiv="refresh" content="2; URL=index.php"></center></div>';
                }else{
                    echo '<div class="alert alert-error"><center>'.$unknown_error.'<meta http-equiv="refresh" content="2; URL=index.php"> ';
                }
            } else {
            echo '<div class="alert alert-error"><center>'.$login_wrong.'<meta http-equiv="refresh" content="2; URL=index.php"></center></div>';
            }
        }
    }

    mysql_close($connection);
}
?>
</div>
<!-- DO_LOGIN -->