<html>
<head>
<script>
function rows()
{
document.getElementById('myTable').rules="rows";
}
function cols()
{
document.getElementById('myTable').rules="cols";
}
</script>
</head>
<body>
<table id="myTable">
<tr>
<td>cell 1</td>
<td>cell 2</td>
</tr>
<tr>
<td>cell 3</td>
<td>cell 4</td>
</tr>
</table>
<br>
<button type="button" onclick="rows()">Show only row borders</button>
<button type="button" onclick="cols()">Show only col borders</button>
<p><b>Note:</b> The rules property is not displayed properly in Internet Explorer prior version 9.</p>
</body>
</html>