Here's a little ajax one I just put together. Enjoy!

#!/usr/bin/perl -w
use strict;
use CGI;
use CGI::Ajax;
use Storable qw/lock_store lock_retrieve/;

our $file = '/tmp/messages';
our $MAX_MESSAGES = 10;

our $table = eval { lock_retrieve($file) } || {};
my $cgi = new CGI;
my $pjx = new CGI::Ajax( 'do_chat' => \&do_chat );

print $pjx->build_html( $cgi, \&show_page);

sub do_chat {
    my ( $name, $msg ) = @_;
    if ( $name && $msg ) {
        push @{ $table->{messages} }, [ $name, $msg ];
        shift @{ $table->{messages} } 
            while @{ $table->{messages} } > $MAX_MESSAGES;
        lock_store $table, $file;
    }
    return join "\n", map "[" . $cgi->escapeHTML($_->[0]) . "] : " . 
            $cgi->escapeHTML( $_->[1] ), @{ $table->{messages} };
}

sub show_page {
    return
        $cgi->start_html( 
               -onload => q{setInterval( 'do_chat( [],[\\'result\\'] )
+',1000 );} )
      . $cgi->pre( { id => 'result' }, " " )
      . $cgi->textfield( -name => 'name', -size => 10, 
            -value => 'name',    -id => 'name' )
      . $cgi->textfield( -name => 'msg',  -size => 50, 
            -value => 'message', -id => 'msg' )
      . $cgi->submit(
        -name    => 'speak',
        -value   => 'speak',
        -onclick => q{do_chat( ['name','msg'],['result'] );}
      ) . $cgi->end_html;
}
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