erro session

[cicero 0]

Warning: session_start() [function.session-start]: Cannot send session cookie - headers already sent by (output started at D:\www\intranet\session\log\efetuar_login.php:5) in D:\www\intranet\session\log\efetuar_login.php on line 37Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at D:\www\intranet\session\log\efetuar_login.php:5) in D:\www\intranet\session\log\efetuar_login.php on line 37

[MrEd 0]

você nao pode usar a session depois de qualquer comando de saida tipo echo e print....