<html>
<body>
<table id="myTable" border="1">
<tr>
<td>100</td>
<td>200</td>
</tr>
<tr>
<td>300</td>
<td>400</td>
</tr>
</table>

<script type="text/javascript">
document.body.offsetLeft;
document.getElementById('myTable').cellPadding="15"
</script>

</body>
</html>