uh, oh errors?

Not sure how to resolve this, looked at php.net for the headers available and this is the error I am recieving: Warning: Cannot add header information - headers already sent by (output started at /path/to/connection/script/db.php:6) in /path/to/login/checking file/auth_done.php on line 13 Here is the code that is in auth_done.php: session_start(); require '/path/to/login/checking file/db.php'; $db_table = 'auth_users'; $sql = "SELECT * from $db_table WHERE un = \"$u_name\" AND pw = password(\"$p_word\")"; $result = @mysql_query($sql,$dbh) or die("Couldn't execute query"); $num = mysql_numrows($result); if ($num !=0) { session_register('u_name'); session_register('p_word'); $msg_success = "Good freakin job poindexter!!"; } else { header ("Location: index.php"); // This is line 13 that is my error generator } This is the code for the db.php script: <?php $dbh = mysql_connect('localhost','username','password') or die('Could not connect to database, please try again later'); mysql_select_db('db_name') or die('Could not select database, please try again later'); ?> Any help would be great! I am assuming there is another way to redirect users besides the header function, just not sure what it is or how to use it. Thanks in advance, Jas