проблема со сложным SQL-запросом

<table width="544" border="1">
  <tr>
    <td width="92"><div align="center">Товар</div></td>
    <td width="115"><div align="center">Количество</div></td>
    <td width="93"><div align="center">Цена</div></td>
    <td width="93"><div align="center">Стоимость</div></td>
    <td width="117"><div align="center">Действия</div></td>
  </tr>
  <tr>

<?php
$t1 = mysql_query("SELECT tovar.foto, tovar.id, zakaz.id_tovar, zakaz.id_user FROM tovar, zakaz WHERE tovar.id = zakaz.id_tovar and zakaz.id_user = '$id_user' order by zakaz.id DESC"); //тот самый сложный запрос

$t2 = mysql_fetch_array($t1);


$st = $t2['kolvo'] * $t2['cena']; //колво * цена = стоимость

do{
  printf("
  <td><img src='%s' width='100px'></td>
  <td>%s</td>
  <td>%s</td>
  <td>%s</td>
  <td></td>", 
  $t2['tovar.foto'],$t2['zakaz.kolvo'],$t2['tovar.cena'],$st);
**
while($t2 = mysql_fetch_array($t1));
?>

</tr>
</table>

<a href="form.php">Оформить</a>