HTTP authentication with PHP

Hi, I am a beginner on PHP. I tried the following code, expecting a small pop-up window allowing me to enter the user name and password. But nothing showed up, except a message of "Text to send if user hits Cancel button". Could anyone give me some suggestiones on how to fix it? Thanks a lot, Linda 1 2 <?php 3 if(!isset($PHP_AUTH_USER)) { 4 Header("WWW-Authenticate: Basic realm=\"My Realm\""); 5 Header("HTTP/1.0 401 Unauthorized"); 6 echo "Text to send if user hits Cancel button\n"; 7 exit; 8 } else { 9 echo "Hello $PHP_AUTH_USER.<P>"; 10 echo "You entered $PHP_AUTH_PW as your password.<P>"; 11 } 12 ?> 13 __________________________________________________ Do You Yahoo!? Kick off your party with Yahoo! Invites. http://invites.yahoo.com/