<html>
<head>
<script>
function leftAlign()
{
document.getElementById('header').align="left";
}
</script>
</head>
<body>
<table width="100%" border="1">
<tr id="header">
<th>Firstname</th>
<th>Lastname</th>
</tr>
<tr>
<td>Peter</td>
<td>Griffin</td>
</tr>
</table>
<br>
<input type="button" onclick="leftAlign()" value="Left-align table row">
<p><b>Note:</b> This example does not work in Internet Explorer.</p>
</body>
</html>