if you've got them in an array it should be fairly easy to do this using an array slice.

my @array = <FILE>; #or however you've retrieved your lines

foreach my $line ( @array[99..199] )
{
  #munge line here
}
[download]

you can put variables in for the bottom and top of your slice range.

p.s., you might really want to consider using either a templating system, CGI.pm, or at the very least HEREDOC syntax to deal with all that messy html output.