session handling works on local server, but not when uploaded to ISP

Hi, I've a login script that works fine on my local server, but when I runs it from my ISP I get the following error: Warning: Cannot send session cookie - headers already sent by (output started at /export/home/thore/public_html/phptest/reporter_view.php:5) in /include/accesscontrol.php on line 9 Warning: Cannot send session cache limiter - headers already sent (output started at /export/home/thore/public_html/phptest/reporter_view.php:5) in /include/accesscontrol.php on line 9 If I had made any mistake in my handling with the session functions, shouldn't that be the case also at my local server? -- anders thoresson