user authentication problem

I have this script which is giving me a couple of problems - 1 - I cannot use include "../connect.inc", I get headers already sent error 2 - I can use this script once, but if I try to reload the page to continue testing I get error "Unable to execute query". Clearing the browsers cache does not help. Any ideas what's going on here? <? $auth = false; // Assume user is not authenticated if (isset( $PHP_AUTH_USER ) && isset($PHP_AUTH_PW)) { //Connect to MySQL mysql_connect( 'localhost', 'autopilots', 'Xfm3dwj' ) or die ( 'Unable to connect to server.' ); //Select database on MySQL server mysql_select_db( 'www2_simradusa_com' ) or die ( 'Unable to select database.' ); // Formulate the query $sql = "SELECT * FROM user WHERE userid = '$PHP_AUTH_USER' AND userpassword = '$PHP_AUTH_PW'"; // Execute the query and put results in $result $result = mysql_query( $sql ); if ( $result != false ) { echo mysql_error(); } // Get number of rows in $result. $num = mysql_numrows( $result ); if ( $num != 0 ) { // A matching row was found - the user is authenticated. $auth = true; } } if ( ! $auth ) { header( 'WWW-Authenticate: Basic realm="Private"' ); header( 'HTTP/1.0 401 Unauthorized' ); echo 'Authorization Required.'; exit; } else { header( 'Location: http://www.simradusa.com/auth_dealers/dealers_page.php' ); } ?> -- Chip Wiegand Computer Services Simrad, Inc www.simradusa.com chip.wiegand@simrad.com "There is no reason anyone would want a computer in their home." --Ken Olson, president, chairman and founder of Digital Equipment Corporation, 1977 (They why do I have 9? Somebody help me!)