$page = intval($_GET['pn']);
if($page <= 0){
$page = 1;
}
$startnum = $page * 10;
$endnum = $startnum + 10;
$path = "../../usr/{$user}/images/";
$dir_handle = @opendir($path) or die("Error could not list image directory");
while ($file = readdir($dir_handle))
{
if($startnum != $endnum){...