setting session varibles in a function in an include file.

I am trying to run session_start, session_register with PHP4 by using a function that is in an include function. The script keeps complaining about "Warning: Cannot send session cookie - headers already sent by (output started at test2.php:259) in test2.php on line 5 Warning: Cannot send session cache limiter - headers already sent by (output started at test2.php:259) in test2.php on line 5" This is the same script that I used when running PHP3 and running the setcookie function without any problem. If I put the function in a file all by itself, it works. There is nothing being printed to the browser prior to calling the function that set the session stuff up. I don't get why it is doing this. Has anyone else run into this problem? Thanks,