<html>
<head>
<title></title>
<style type="text/css">
<!--
#a
{
        background-color:background;
}
-->
</style>
</head>

<body>
<table id="a">
<tr>
        <td>This table should NOT be visible</td>
</tr>
</table>

<table id="b" style="background-color:background;">
<tr>
        <td>This table should NOT be visible</td>
</tr>
</table>


<script language="JavaScript" type="text/javascript">

<!--
document.getElementById("a").style.visibility = "hidden";
document.getElementById("b").style.visibility = "hidden";
//-->

</script>
</body>
</html>