function checkdata() {
	// contact
	if (document.contact.name.value.length == 0) {
		alert("Nama Anda belum di tulis !!!");
		document.contact.name.focus();
		return false;
		}
	if (document.contact.email.value.length == 0) {
		alert("Email Anda belum di tulis !!!");
		document.contact.komentar.focus();
		return false;
		}
	if (document.contact.comment.value.length == 0) {
		alert("Anda belum menuuliskan pesan !!!");
		document.contact.comment.focus();
		return false;
		}
	if (document.contact.security_code.value.length == 0) {
		alert("Please Type Your Validation Code!!!");
		document.contact.security_code.focus();
		return false;
	return true;
}