Tryit Editor v1.4

<html>
<head>
<script type="text/javascript">
function padding()
{
document.getElementById('myTable').cellPadding="15";
}

function spacing()
{
document.getElementById('myTable').cellSpacing="15";
}
</script>
</head>
<body>

<table id="myTable" border="1">
<tr>
<td>100</td>
<td>200</td>
</tr>
<tr>
<td>300</td>
<td>400</td>
</tr>
</table>
<br />
<input type="button" onclick="padding()" value="Change Cellpadding">
<input type="button" onclick="spacing()" value="Change Cellspacing">

</body>
</html>

Your Result:

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