if i understand you correctly this is the way i do something simular...
where i want the called page to appear i put
<? @require ('director.php') ?>
director.php beinf the file that has the smarts to know what i am asking for...
like so
<?
switch ($page){ //$page is the action name you use in "?page=some_page.php"
default:
@require ('welcome.php');
break;
case "":
@require ('welcome.php');
break;
case "home":
@require ('welcome.php');
break;
case "some_link1":
@require (''folder_a/some_file.php');
break;
case "some_link2":
@require ('folder1/folder2/some_file.php');
break;
?>
You can then just keep adding new switches as shown
hope that helps!