I'm having problems with errors saying that session cookies cannot be sent, as header data has already been sent, and cant figure out why! I have the session start command as the first line of php, and it is enclosed in the head tags. The error message is...

Warning: session_start(): Cannot send session cookie - headers already sent by (output started at /home/abdpqj/public_html/login.php:3) in /home/abdpqj/public_html/login.php on line 4

The code I am using is...

Code:
<html>
<head>
<?
session_start();
$_SESSION['logged']="0";
?>
</head>
<body>
<form name="login" action="member.php" method="post">
Username:  <input name="name" type="text" id="name"><br>
Password:  <input name="pass" type="password" id="pass"><br>
<input type="submit" name="submit" value="submit">
</form>
</body>
</html>