Posdata: este es otro de los errores:
PHP Notice: Use of undefined constant usuario_nick - assumed 'usuario_nick' in D:\XVRT\ipee.es\Html\php\portada.php on line 3
PHP Notice: Undefined index: usuario_nick in D:\XVRT\ipee.es\Html\php\portada.php on line 3
PHP Warning: mysql_connect() [<a href='function.mysql-connect'>function.mysql-connect</a>]: Access denied for user 'qnt212'@'217.76.130.95' (using password: YES) in D:\XVRT\ipee.es\Html\php\config.php on line 10