Probably because your script is more a mess than a Perl Script. $fields{'continue'} may be an empty string, or undef, not even existing in the hash. You won't find out, you haven't even enabled warnings and the strict pragma. Where does %fields come from? Hmm, it's coming from an a Broken CGI Parser...
Before you go on, read use CGI or die, Idiotic Perl, `perldoc strict`, `perldoc warnings`, `perldoc perlsub` (because you didn't get Perl 5 subroutines), `perldoc perlstyle` (because it helps in general).
I hope you don't wamnt to spread this "thing" over the web as one could guess from these comments at its beginning. Don't, it is bad.
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