PHP 不能显示数据

<?php
/*
* PHP100Job v1.0
* Programmer : Msn/QQ haowubai@hotmail.com (925939)
* www.php100.com Develop a project PHP - MySQL - Apache
* Window 2003 - Preferences - PHPeclipse - PHP - Code Templates
*/
include("conn.php");

include("head.php");
$SQL="SELECT * FROM `message` order by id desc";
$query=mysql_query($SQL);
while($row=mysql_fetch_array($query)){
?>

<table width=500 border="0" cellpadding="5" cellspacing="1" bgcolor="#add3ef">
<tr bgcolor="#eff3ff">
<td>标题：<?=$row[title]?> 用户：<?=$row[user] ?></td>
</tr>
<tr bgColor="#ffffff">
<td>内容：<?=$row[content]?></td>
</tr>
</table>
<?php
}