function checkValue() {
	var writeKey = document.getElementById("confirm_key");
	var key = getKey();
	var t = 0;
	for (i = 0; i < key.length; i++) {
		var n = key.charAt(i);
		if(!isNaN(n)) {
			t += parseInt(n);
		}
	}
	writeKey.value = (key + t.toString());
}

function getKey() {
	var s = document.cookie;
	var idx1 = idx2 = 0;
	idx1 = s.indexOf("cookie_confirm_key");
	var key = s.substring(idx1 + 19, idx1 + 19 + 32);
	return key;
}