This is a Tic Tac Toe program I made recently, I used a HTML document with frames that contains the following CGI page and a HTML document (tic2.htm) that refreshes automatically so both players can see when the other makes his move. Well here's the CGI part.

#!/usr/local/bin/perl

use CGI ':standard';
print header;
print start_html('Tic Tac Toe'),
    
    start_form,
    "Clear the boxes? ",
    radio_group(
                      -name=>'clear',
                      -Values=>['yes','no',],
                      -default=>'no'),
    
    p,
    "What are you playing? ", 
    radio_group(
               -name=>'team',
               -Values=>['X','O',],
               -default=>'X'),
    
     p,
     "Across: ",
    radio_group(
               -name=>'across',
               -Values=>[1,2,3,],
               -default=>1),
    
    p,
    "Down: ",
    radio_group(
               -name=>'down',
               -Values=>[1,2,3,],
               -default=>1),
   
    p,
    submit,
    end_form,
    hr;



if (param()) {
    
$across = (param('across'));
$down = (param('down'));
$team = (param('team'));
$move = $down."_".$across;

$file="../tic2.htm";
$file2="../tic.htm";

open FILE, "<$file" or die "Sorry $!";       
open FILE2, ">$file2" or die "Sorry $!"; 

for $line (<FILE>) {

$line =~ s/<! $move ><img src=bla.bmp>/<! $move ><img src=$team.bmp>/g
+; 
#The above checks each line of tic2.htm for the move selected (ex. 1_2
+) and replaces 
#that squares image bla.bmp with either O.bmp or X.bmp


print FILE2 $line;


    };

close FILE2;
close FILE;
#Closes the filehandles so that their uses (read, write) can be revers
+ed 

open FILE, ">$file" or die "Sorry no luck opening file";
open FILE2, "<$file2" or die "Sorry";

for $line (<FILE2>) {

print FILE $line;
    
    };

close FILE;
close FILE2;

if ((param('clear')) eq 'yes') {

open FILE, "<$file" or die "Sorry $!";
open FILE2, ">$file2" or die "Sorry $!";

for $line (<FILE>) {

$line =~ s/X/bla/g;
$line =~ s/O/bla/g;

print FILE2 $line;

    }; 

close FILE;
close FILE2;

open FILE, ">$file" or die "Sorry $!";
open FILE2, "<$file2" or die "Sorry $!";

for $line (<FILE2>) {

print FILE $line;

    }; 

        };

            };

print end_html;
[download]

Any feedback you could offer would be appreciated, thanks.