<?php session_start(); $auth = false; // Assume user is not authenticated $reg =& new Collection('userslist'); $auth = $reg->user_exists($_SESSION["USER"], $_SESSION["PW"]); if ( ! $auth & $mode == 'edit' ) { header( 'WWW-Authenticate: Basic realm="Private"' ); header( 'Location:registro.php?msj=1' ); exit; } ?>