Fejl i php kode

Jeg får denne fejl
Notice: Undefined variable: i in C:\Inetpub\wwwroot\news\php\index.php on line 16

Her er koeden

<!doctype html public "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=iso-8859-1">
<link rel="stylesheet" type="text/css" href="stylesheet.css">
</head>

<body>

<h1>Nyeste nyheder</h1>

<?php
include('inc.config.php');
$query = mysql_query("SELECT id,title,image,synopsis FROM news ORDER BY id DESC LIMIT 5") or die(mysql_error());
while ($row = mysql_fetch_assoc($query)) {
    if ($i++ != 0) echo '<div class="hr"></div>';
    echo '<h2><a href="news.display.php?id='.$row['id'].'">'.$row['title'].'</a></h2>';
    echo empty($row['image']) ? '' : '<img src="files/'.$row['image'].'" class="image">';
    echo $row['synopsis'];
}
?>

<div class="hr"></div>
<a href="http://schaefner.dk" class="author">schaefner|dk</a> <a href="news.search.php">Søg efter nyhed</a> | <a href="admin/">Administration</a>

</body>
</html>