<? 
include('concha.php');
mysql_connect ("$host", "$usuario", "$contra");
mysql_select_db ("$basedatos");

$sql = "SELECT * FROM notas_tapa WHERE cu3er = '1' OR cu3er = '2' OR cu3er = '3'";

$consulta = mysql_query ($sql);
while ($row = mysql_fetch_array($consulta))
{
$nnnn = "si";
}
mysql_free_result($consulta);
?>

<?php if ($nnnn == 'si') {
?>
<br />
<table width="100%" border="0" cellspacing="0" cellpadding="0">
  <tr>
    <td align="left"><iframe frameborder="0" height="300" width="315" marginheight="0" marginwidth="0" scrolling="no"   src="cu3er1.php"></iframe></td>
    <td  align="center"><iframe frameborder="0" height="300" width="315" marginheight="0" marginwidth="0" scrolling="no"   src="cu3er2.php"></iframe></td>
    <td align="right"><iframe frameborder="0" height="300" width="315" marginheight="0" marginwidth="0" scrolling="no"   src="cu3er3.php"></iframe></td>
  </tr>
</table>
<br /><?php } else {};?>