function midi_survey_2008_submit() {
    if (midi_2008_check_form()) {
	i = document.getElementById('midi-survey-intro');
	s = document.getElementById('midi-survey-2008');
	t = document.getElementById('midi-survey-thanks');
	if (!s.submit()) {
	    i.style.display = 'none';
	    s.style.display = 'none';
	    t.style.display = '';
        }
    }
}

function midi_2008_check_form() {
    s = document.getElementById('midi-survey-2008');
    if (s.email.value == '') {
	alert('请填写你的Email');
	return false;
    }
    else if (!check_email(s.email.value)) {
	alert('请填写有效的邮箱地址');
	return false;
    }
    else if (!radio_checked(s.q1)) {
	alert('请选择一个建议');
	return false;
    }
    else if (s.suggestion.value == '') {
	alert('总要想出一个建议吧？');
	return false;
    }
    else {
	return true;
    }
}

function check_email(email) {
    var reg_exp = /^[a-z][\w\-\.]*@[\w\.]+\.[a-z]{2,3}/i;
    return reg_exp.test(email);
}

function radio_checked(radio_group) {
    for (var i = 0; i < radio_group.length; i++) {
        if (radio_group[i].checked)
	    return true;
    }
    return false;
}

function open_survey() {
    i = document.getElementById('midi-survey-intro');
    s = document.getElementById('midi-survey-2008');
    t = document.getElementById('midi-survey-thanks');
    s.reset();
    t.style.display = 'none';
    i.style.display = '';
    s.style.display = '';
}

function goto_result() {
    window.open('http://act.greenpeace.org.cn/event/midi2008/result.html', 'result', 'status=1,toolbar=0,location=0,scrollbars=1,height=600,width=500');
    return false;
}