[php] redirection and session start

Hey ppl,

What i need to do is to start a session and be able to redirect a user on the same php page.

It appears that in php it requires that session_start() be the first thing on the page AND header() has to be the first thing on the page.

<?php session_start();

//other code goes here
//then try to redirect
header("Location:somepage.php");
?>

Therefore if i try to do the above i get the warning message --"blah blah .....headers already sent ....blah blah"

Is there anyway of doing both on the same page????

Any help or ideas appreciated,
A