function setCookieData(data)		// キーと消去日の設定
{
var expdate = new Date ();
expdate.setTime (expdate.getTime() + (24 * 60 * 60 * 1000 * 31 * 3));
SetCookie (cookie_name, data, expdate);
}

function SetCookie (name,value)		// 書き込み
{
var argv = SetCookie.arguments;
var argc = SetCookie.arguments.length;
var expires = (argc > 2) ? argv[2] : null;
var path    = (argc > 3) ? argv[3] : null;
var domain  = (argc > 4) ? argv[4] : null;
var secure  = (argc > 5) ? argv[5] : false;

document.cookie = name + "="  + value +
 ((expires == null) ? ""	: ("; expires=" + expires.toGMTString())) +
 ((path == null)    ? ""	: ("; path=" + path)) +
 ((domain == null)  ? "" 	: ("; domain=" + domain)) +
 ((secure == true)  ? "; secure" : "");
}

function GetCookie (name)		// 検索
{
	var arg  = name + "=";
	var alen = arg.length;
	var clen = document.cookie.length;
	var i = 0;
	while (i < clen)
		{
		var j = i + alen;
		if (document.cookie.substring(i, j) == arg)
		return getCookieVal (j);
		i = document.cookie.indexOf(" ", i) + 1;
		if (i == 0) break;
		}
	return null;
}

function getCookieVal (offset)		// 読み込み
{
var endstr = document.cookie.indexOf (";", offset);
if (endstr == -1)
	endstr = document.cookie.length;
	return unescape(document.cookie.substring(offset,endstr));
}

function DeleteCookie (name)		// 消去
{
var exp =new Date();
exp.setTime(exp.getTime() - 1);
var cval = GetCookie (name);
document.cookie = name + "=" + cval + "; expires=" + exp.toGMTString();
}