#!/usr/bin/perl -w

use strict;
use warnings;
use CGI;

my $co    = new CGI;
my $color = 'red';

print $co->header;
print $co->start_html();
print $co->start_form;
print $co->radio_group(
        -name => 'color',
        -id   => 'color',
        -values => ['red','yellow','green'],
        -default => 'red',
        -onClick => "return select_color(this)"
    ).$co->p;
print $co->textarea(
    -id   => "textarea",
    -style=> "background-color:$color;
        color:blue",
);
print $co->end_form;
print $co->end_html;
print <<COLOR_SCRIPT;
<script language="JavaScript">
function select_color(rb_obj) {
    var color   = rb_obj.value;
    var ta_obj  = document.getElementById('textarea');
    ta_obj.style.background = color;
    return color;
}
</script>
COLOR_SCRIPT