add some content to your tds.
maybe something like:
Code:
.td1 { border-right: 3px double #990000; width: 160px; vertical-align: top;}
.td2 { width: 160px; vertical-align: top;}
.td3 { border-left: 3px double #990000; width: 160px; vertical-align: top;}
.td1 p, .td2 p, .td3 p {
margin: 0;
padding: 6px;
}
Code:
<table class="borders" width="487" height="300" cellpadding="0" cellspacing="0">
<tr>
<td class="td1"><p>a</p></td>
<td class="td2"><p>b</p></td>
<td class="td3"><p>c</p></td>
</tr>
</table>