Display Multiple Webpages on a Single Page

<html>
<head>
<meta content="text/html; charset=ISO-8859-1"
http-equiv="content-type">
<title></title>
</head>
<body>
<table style="width: 1000px;">
<tbody>
<tr>
<td align="center" width="50%"><iframe src="http://slashdot.org" style="width: 500px; height: 400px;"></iframe><br>
</td>
<td align="center" width="50%"><iframe src="http://slashdot.org" style="width: 500px; height: 400px;"></iframe><br>
</td>
</tr>
<tr>
<td align="center" width="50%"><iframe src="http://slashdot.org" style="width: 500px; height: 400px;"></iframe><br>
</td>
<td align="center" width="50%"><iframe src="http://slashdot.org" style="width: 500px; height: 400px;"></iframe><br>
</td>
</tr>
</tbody>
</table>
</body>
</html>