Prueba con esto y me cuentas...
Código PHP:
<?php
while($row_comments = mysql_fetch_assoc($comments))
{
if(!empty($row_comments['contenido']))
{
?>
<table width="90%" align="center" cellpadding="4" style="border:dashed #CCC 2px; background:#F3F3F3">
<tr>
<td><div align="left"><?php echo $row_comments['nombre']; ?> - <a href="mailto:<?php echo $row_comments['correo']; ?>"><img src="http://www.forosdelweb.com/f18/chismes/images/mail.gif" width="12" height="10" border="0" alt="<?php echo $row_comments['correo']; ?>" /></a></div>
<div align="left" style="font-family:Arial, Helvetica, sans-serif; font-size:9px;"><?php echo $fechag ?></div>
<div align="left" class="flet" style="font-family:Arial, Helvetica, sans-serif; font-size:12px; padding-top:8px; margin-top:4px; border-top:dashed 1px #333;"><?php echo $row_comments['contenido']; ?></div></td>
</tr>
</table>
<br />
<?php
}
}
?>