Achieved with the following code:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>Untitled Document</title>
</head>
<body>
<?php
echo '<table class="table"><tr>';
$folders = @scandir('Users');
foreach($folders as $item):
if ((substr($item, 0, 1) == '.') || (preg_match("/\.php$/", $item)))
continue;
?>
<td align="top">
<table width="220" border="1" valign="top">
<tr><th width="210" valign="top"><?php echo $item;?></th></tr>
<?php
if (is_dir("Users/$item"))
$target_folders = @scandir("Users/$item/uploaded/");
foreach($target_folders as $target_item){
if ((!preg_match("/^[.]/",$target_item)) || (!is_dir("Users/$item/uploaded/$target_item"))){
if ((substr($target_item, 0, 1) == '.'))
continue;
?><tr><td><?php echo $target_item ;?></td></tr><?php
}
}
?>
</table>
</td>
<?php
endforeach;
echo '</tr></table>';
?>
<style type="text/css">
td {
vertical-align: top;
}
</style>
</body>
</html>