Code:
<table>
<tr valign="top">
<form method="post" action='<?php $_SERVER['PHP_SELF']; ?>'"page_your_on.php?page=links">
<td><INPUT type="submit" value="Links A" name="A"/></td>
<td><INPUT type="submit" value="Links B" name="B"/></td>
</tr>
</table>
</form>
if (isset($_POST["B"])) {
include('new_links.php');
} else {
?>
Link to site A
Link to site A
Link to site A
} the part in red I would have to screw around with depending on the site.
new_links would have the second set of links and needs to be in the same directory
as page_your_on
This will give you 2 buttons. One for links A page and one for links B page