note 38858 rejected from function.setcookie by didou

Note Submitter: gravy_2004@hotmail.com ---- i know that the ssetcookies function should be called b4 any tags or other function, then i just do it so. but it display nothing but "setcookie("cuky_info","cuki_data",0,"","",0);" on the webpage. Later on, i try the following code: ------------------------------------------------ <html> <?php ob_start(); setcookie("cuky_info","cuki_data",0,"","",0); ob_end_flush(); ?> </html> ------------------------------------------------ but it display folowing error this time: Warning: Cannot modify header information - headers already sent by (output started at C:\Inetpub\wwwroot\tri\setcuki.php:3) in C:\Inetpub\wwwroot\tri\setcuki.php on line 6 can anyone tell me whether it is due to my browser's setting or mistakes in my code. thx in advance.