I just found a really cool way to do one pixel table borders but it requires CSS. Isaac informs me that this will also work on a div tag.

<style>
    table { border-collapse: collapse; }
    td, th { border: 1px solid #000000; vertical-align: baseline; }
</style>

<table border="0" cellpadding="3">
<tr>
    <td>Cell 1</td>
    <td>Cell 2</td>
</tr>
<tr>
    <td>Cell 3</td>
    <td>Cell 4</td>
</tr>
</table>