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    function ajaxUpdateFName() {
      if(alreadyUpdating) {
          return;
...
      }
      srefresh.send(params);
    }

sub get_fname($self, $ua) {

    my $dbh = $self->{server}->{modules}->{$self->{db}};
...
            type    => "text/plain",
            data    => $jsondata);
}