<html>
<head>
<script type="text/javascript">
function alertCaption()
{
alert(document.getElementById("table1").caption.innerHTML);
}
</script>
</head>
<body>
<table id="table1" border="1">
<caption>This is a table caption</caption>
<tr>
<th>Firstname</th>
<th>Lastname</th>
</tr>
<td>Peter</td>
<td>Griffin</td>
</table>
<br />
<input type="button" onclick=alertCaption() value="Alert table caption" />