<?php
error_reporting(E_ALL)

$pagina_main = $_POST['page'];

$link = array (
			"idx" 		=> "main.php",
			"bla"		=> "admin.php",
			);

if ( !isset($pagina_main) || empty($pagina_main) )
	$pagina_main = 'idx';

if ( !isset( $link[$pagina_main] ) )
	$pagina_main = 'idx';

include($link[$pagina_main]]);


?>