Código errado

O que tem de errado nesse código?

<?php do { ?>
 <tr valign="middle">

 <?php
 $empresa = $row_recMostraUsu['idEmpresa'];
 $sql_emp = "SELECT idCadEmpresa, empresaCadEmpresa FROM tbempresa WHERE idCadEmpresa = $empresa";
 $query_emp = mysql_query($sql_emp, $conn);
 ?>

 <td height="25" class="titulo"><a href="detUsu.php?id=<?php echo $row_recMostraUsu['idUser']; ?>&emp=<?php echo $row_recMostraUsu['idEmpresa']; ?>" class="titulo"><?php echo $row_recMostraUsu['nomeUser']; ?></a></td>
 <td height="25" class="titulo"><a href="detUsu.php?id=<?php echo $row_recMostraUsu['idUser']; ?>&emp=<?php echo $row_recMostraUsu['idEmpresa']; ?>" class="titulo"><?php echo $row_recMostraUsu['loginUser']; ?></a></td>
 <td class="titulo"><?php echo $emp['empresaCadEmpresa']; ?></td>
 <td width="10%" height="25" align="center" bgcolor="#666699" class="menuadm"><a href="altUsu.php?idAlt=<?php echo $row_recMostraUsu['idUser']; ?>" class="style2">Editar</a></td>
 <td width="10%" height="25" align="center" bgcolor="#666699" class="menuadm"><a href="delUsu.php?idDel=<?php echo $row_recMostraUsu['idUser']; ?>" class="style1">X</a></td>
</tr>
 <?php } while (($row_recMostraUsu = mysql_fetch_assoc($recMostraUsu)) && ($emp = mysql_fetch_array($query_emp))); ?>