[HTML]Centrer une image dans la page

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Document sans nom</title>
<style type="text/css">
<!--
#texte {
	font-size: 36px;
	color: #FFFF00;
	font-weight: bold;
	position: absolute;
}
img {
	position: absolute;
}
-->
</style>
</head>

<body>
<img src="tonimage.jpg" width="450" height="338" alt="" />
<div id="texte">Comme ça ?</div>
</body>
</html>