*** INDEX.PHP ***

$query = "SELECT * FROM `users` WHERE username = '$username'";
$result = mysql_query($query, $con);
$row = mysql_fetch_row($result);
$num_rows = mysql_num_rows($result);
$hashedpass = decryptpass($password, $row[4]);

if(!$num_rows || $num_rows < 1 ) {
    $error = "Login Failed";
} elseif($row[2] != $hashedpass) {
    $error = "Invalid Password";
} else {
    // Login Successful! Set session variables
    $_SESSION['loggedIn'] = true;
    $_SESSION['username'] = $username;
}


*** FUNCTIONS.PHP ***

function encryptpass($password) {
    $SALT = time();
    $SALTpass = $SALT.$SALT;
    $hash = sha1(md5($SALTpass.$password.$SALTpass));
    return $hash;
}

function decryptpass($password, $dbpass) {
    $SALTpass = $dbpass.$dbpass;
    $hash = sha1(md5($SALTpass.$password.$SALTpass));
    return $hash;
}