function validate(form) {
        var ok = true;

        if (form.txt.value.length < 3) {
                alert('Write some more text! (at least 3 characters)');
                ok = false;
        }

        return ok;
}

function send_form() {
        var src = document.forms[0];
        var dest = document.forms[1];

        // un rot13 asi para el que recibe el link no es tan obvio lo que dice.
        var s = src.txt.value;
        var aux = s;
        aux = aux.replace(/[a-z]/ig, function(c) { return String.fromCharCode((c <= "Z" ? 90 : 122) >= (c = c.charCodeAt(0) + 13) ? c : c - 26); });

        dest.txt.value = aux;

        dest.submit();
        return false;
}