function checkComment(form){
	var pass = false;
	if (form.email.value == "" || form.komentar.value == "" || form.security_code.value == "") {
		alert("Harap isi semua field yang dibutuhkan (ditandai dengan *)");
		return false;
	}
	if (form.email.value != "" && form.komentar.value != "" && form.security_code.value != "") {
		return checkEmail(form.email);
	}
}

function checkEmail(field){
	with (field){
		apos = value.indexOf("@")
		dotpos = value.lastIndexOf(".")
		if (apos < 1 || dotpos - apos < 2){
			alert("Harap masukan alamat email yang valid");
			return false;
		}
		else {
			return true;
		}
	}
}