Need to send mail with contents which is in Text areas

Hi,
i have an HTML form with two Text areas and a button. After I type the contents into the Text Area, if I press the Button, a mail should be sent to a default person with the message containing the contents of the text areas.
How can I do it with perl? Cant I do it with client side JavaScript?

Here:

#!/usr/bin/perl

use CGI;
$query = new CGI;

$first_textarea_data = $query->param('textarea_a');
$second_textarea_data = $query->param('textarea_b');

$mailer = "/path/to/sendmail";

unless(open(MAIL, "|$mailer -t")) {
print "Unable to open sendmail at: $mailernn";
exit;
}

print MAIL "TO: recipient@some.comn";
print MAIL "SUBJECT: This is some fine mail!n";
print MAIL "FROM: you@your.comnn";

print MAIL $first_textarea_data;
print MAIL $second_textarea_data;

close(MAIL);

print "Location: <A HREF="http://www.foo.com/your_thank_you_page.htmlnn";" TARGET=_blank>http://www.foo.com/your_thank_you_page.htmlnn";</A>

have phun.

Josh