#!/usr/bin/perl -w
use strict;

use CGI qw(:standard);
use Date::Calc  qw(:all);
use CGI::Carp qw(fatalsToBrowser warningsToBrowser);

use HTML::AsSubs;
use HTML::Element;
use HTML::CalendarMonth;


my  $data="/path/data.txt";
my @Calendar =  ();  
#my $checkthree = "1000";
my $checkthree = param ('check');


open (FILE,"$data") || die "whoops 1: $!";
my @all=<FILE>;
close (FILE);
foreach my $line (@all){
    my ($one,$two,$three,$four,$five,$six,$seven,$eight) = split "\t",
+$line;
    if ($three eq $checkthree) {
    @Calendar = split /\s+/,$seven; 

    }
}


my @dates = sort @Calendar;




print header(), start_html(-title => "Calendars");

while (defined $dates[0]) {
  my $days = $dates[0];
  my ($year, $month, $day) = Add_Delta_Days(1,1,1, $days - 1);
  @dates = CreateCal($year, $month, @dates);
}

print end_html();

exit(0);

sub CreateCal {
  my ($cyear, $cmonth, @dates) = @_;
  my (@days, @temp);
  foreach my $days (@dates) {
    my ($year, $month, $day) = Add_Delta_Days(1,1,1, $days - 1);
    if ($year == $cyear && $month == $cmonth) {
      push (@days, $day);
    } else {
      push (@temp, $days);
    }
  }

  my $c = new HTML::CalendarMonth(
          month      => $cmonth,
          year       => $cyear,
  );
  $c->item($c->month)->wrap_content(font({size => '+2'}));
  $c->item($c->dayheaders)->wrap_content(font({size => '-1'}));
  $c->item(@days)->attr(bgcolor => '#CC0000');
 
  print "<p>", $c->as_HTML, "</p>";
  return @temp;
}
[download]

(appreciation to Mr. Muskrat for the main part of the script)

My problem is that when I take a value via param( ) the result is a blank screen. If I comment out the param( ) line and use uncommentedmy $checkthree = "1000"; the script works fine.

Careful debugging led me to the use HTML::AsSubs; but I'm afraid I'm not knowledgable enough to get to the bottom of it.

I wonder if anyone could help me?