Prueba con esto:
Código PHP:
<table border="0" cellpadding="0" cellspacing="0">
<tr>
<td valign="top" >
<iframe name="iframetag" marginwidth="0" marginheight="0" src="<?php echo $smiletagURL; ?>view.php" width="160" height="300" frameborder="0" class="smiletagFrame">
Your Browser must support IFRAME to view
this page correctly
</iframe>
</td>
</tr>
<tr>
<td>
<?
if($my->username <> ""){
echo '
<form name="smiletagform" method="post" action="'.$smiletagURL.'post.php" target="iframetag">
Nick<br /><input type="hidden" name="name" value="<?php echo $my->username; ?>"/>
<br />
Mensaje<br /><textarea name="message_box" rows="2" cols="15"></textarea>
<br />
<input type="hidden" name="message" value="" />
<input type="submit" name="submit" value="Enviar" onclick="clearMessage()" />
<input type="reset" name="reset" value="Borrar" /><br />
</form>';
}
?>
</td>
</tr>
</table>
Suerte!