HTML tags in auth.php script

PHP 4.2.3 APACHE 1.3.27 Windows 2K Hello every one. I am still learning how PHP works. Can some one answer this for me please. This piece of code here works fine ONLY without the HTML tags (The first line and the last lines in the code). The moment I add these lines I get the following error: (By the way I don't get these errors if I execute this script on UNIX) Warning: Cannot add header information - headers already sent by (output started at c:\phpdev\www\public\auth.php:2) in c:\phpdev\www\public\auth.php on line 4 Warning: Cannot add header information - headers already sent by (output started at c:\phpdev\www\public\auth.php:2) in c:\phpdev\www\public\auth.php on line 5 Text to send if user hits Cancel button Basically what I am trying to do is to add this line to get a background image for this page "auth.php" in my images folder. <body background=\"../pics/creme_swirl.jpg\" text=\"green\" link=\"blue\" alink=\"red\" vlink=\"red\"> <HTML> <?php if (!isset($_SERVER['PHP_AUTH_USER'])) { header('WWW-Authenticate: Basic realm="My Realm"'); header('HTTP/1.0 401 Unauthorized'); echo 'Text to send if user hits Cancel button'; exit; } else { echo "<p>Hello {$_SERVER['PHP_AUTH_USER']}.</p>"; echo "<p>You entered {$_SERVER['PHP_AUTH_PW']} as your password.</p>"; } ?> </HTML>