I added the following validate email function to my script and I then got error (see error) message.  I narrowed it down to the fsockopen() line in the validate email function. If I rem out that line then the mysql_insert_id() function works correctly.

Error message: 

Warning: 1 is not a MySQL link index in /home/chris/public_html/chicorentals/confirm.php3 on line 94

Verify email address function:

function validateEmail ($email){
   global $SERVER_NAME;

   $return = array(false,  "" );
   list ($user, $domain) = split( "@", $email, 2);
   $arr = explode( ".", $domain);
   $count = count ($arr);
   $tld = $arr[$count - 2] .  "." . $arr[$count - 1];
   if(checkdnsrr($tld,  "MX")) {
      if(getmxrr($tld, $mxhosts, $weight)) {
         for($i = 0; $i < count($mxhosts); $i++){
               $fp = fsockopen($mxhosts[$i], 25);
            if ($fp){
               $s = 0;
               $c = 0;
               $out =  "";
               set_socket_blocking($fp, false);
               do {
                  $out = fgets($fp, 2500);
                  if(ereg( "^220", $out)){
                           $s = 0;
                     $out =  "";
                     $c++;
                  }
                  else if(($c > 0) && ($out ==  "")){
                     break;
                  }
                  else {
                     $s++;
                  }
                  if($s == 9999) {
                     break;
                  }
               } while($out ==  "");
               set_socket_blocking($fp, true);
               fputs($fp,  "HELO $SERVER_NAME\n");
               $output = fgets ($fp, 2000);
               fputs($fp,  "MAIL FROM: <info@" . $tld .  ">\n" );
               $output = fgets($fp, 2000);
               fputs($fp,  "RCPT TO: <$email>\n");
               $output = fgets($fp, 2000);
               if(ereg(  "^250", $output )) {
                  $return[0] = true;
               }
               else {
                  $return[0] = false;
                  $return[1] = $output;
               }
               fputs ($fp,  "QUIT\n");
               fclose($fp);
               if($return[0] == true){
                  break;
               }
            }
         }
      }
   }
   return $return;
}



Configure command: ./configure '--with-mysql=/usr/local/mysql' '--with-imap' '--with-gd=/usr/local/gd1.3' '--with-apache=/usr/local/apache_1.3.9' '--enable-track-vars'
php3.ini file path is set to: /usr/local/lib