Create Login Page

Hi All I am trying to create a login page using php and mysql database. This is the code that I am trying to use: <?php // File Name: auth04.php // Check to see if $PHP_AUTH_USER already contains info if (!isset($PHP_AUTH_USER)) { // If empty, send header causing dialog box to appear header('WWW-Authenticate: Basic realm="My Private Stuff"'); header('HTTP/1.0 401 Unauthorized'); exit; } else if (isset($PHP_AUTH_USER)) { // If non-empty, check the database for matches // connect to MySQL mysql_connect("localhost", "mysql", "sunny") or die ("Unable to connect to database."); // select database on MySQL server mysql_select_db("masterstream") or die ("Unable to select database."); // Formulate the query $sql = "SELECT *

                FROM guest
                WHERE login='$PHP_AUTH_USER' and password='$PHP_AUTH_PW'";

// Execute the query and put results in $result $result = mysql_query($sql); // Get number of rows in $result. 0 if invalid, 1 if valid. $num = mysql_numrows($result); if ($num != "0") { echo "<P>You're authorized!</p>"; exit; } else { header('WWW-Authenticate: Basic realm="My Private Stuff"'); header('HTTP/1.0 401 Unauthorized'); echo 'Authorization Required.'; exit; } } ?> This is the error that I get when I point my browser to this page both when the script is run locally and on th eremte webserver. btw: I am running Mac OS Jagaur Warning: Cannot add header information - headers already sent by (output started at /Users/pgarcha/Sites/auth.php:7) in /Users/pgarcha/Sites/auth.php on line 13 Warning: Cannot add header information - headers already sent by (output started at /Users/pgarcha/Sites/auth.php:7) in /Users/pgarcha/Sites/auth.php on line 14 Many Thanks --Pushpinder