#!/usr/bin/perl
use warnings;
use CGI::Pretty qw(:all);
use strict;
print header();
if (param('first') and param('last')) {
    my $first=ucfirst(lc(param('first')));
    my $last=ucfirst(lc(param('last')));
    print start_html("Welcome"),h1("Hello, $first $last");
} else {
    print start_html(title=>"Enter your name");
    if (param('first') or param('last')) {
       print center(font({color=>'red'},"You must enter a",(param('last')?"first":"last"),"name"));
    }
    print generate_form();
}
print end_html();
sub generate_form {
    return start_form,
           h1("Please enter your name:"),
           p("Last name", textfield('last')),
           p("First name", textfield('first')),
           p(submit),
           end_form;
}