<input type="button" onclick="moveCaption()" value="Move table caption">
<html>
<head>
<style type="text/css">
caption
{
caption-side:bottom;
}
</style>
<script type="text/javascript">
function moveCaption()
document.getElementById('myTable').style.captionSide="right";
</script>
</head>
<body>
<table border="1" id="myTable">
<caption>This is a caption</caption>
<tr>
<td>100</td>
<td>200</td>
</tr>