Ancre dans une liste déroulante

$sql_menu = "SELECT * FROM articles";
$requete_menu = mysql_query($sql_menu) or die( mysql_error());

echo "<form>\n<select name=\"menu\" size=\"1\ onChange=\"windows.location.href = this.options[this.selectedIndex].value;\">\n";
while ($row_menu = mysql_fetch_array($requete_menu)) {
	echo "<option value=\"".$row_menu['ID_chapitre']."\">".$row_menu['titre']."</option>\n";
}
echo "</select>\n</form>\n";