header.

I am working with smarty and in my system i have got a lot of includes. In one of these includes, somtimes i must do header("Location: some_page.php") but when i try to do it i get the follow error: Warning: Cannot modify header information - headers already sent by (output started at /usr/local/apache2/htdocs/www2.superbanco.com.br/html/index.php:1) in /usr/local/apache2/htdocs/www2.superbanco.com.br/html/modules/loja/identificacao.php on line 15 My question is, can i avoid this error? If so, how? -- João Cândido de Souza Neto Curitiba Online joao@curitibaonline.com.br (41) 3324-2294 (41) 9985-6894 http://www.curitibaonline.com.br