<style type="text/css">

.tb{BORDER-BOTTOM: #000000 1px dotted;BORDER-top: #000000 1px dotted;BORDER-LEFT:

#000000 1px dotted;BORDER-RIGHT: #000000 1px dotted;}

</style>

<table width="100%" border="0" cellspacing="0" cellpadding="0">

<tr>

<td class="tb"><center>要设置的文字</td>

</tr>

</table>