var s,cn,linkurl;
	linkurl=document.referrer;

	c_date = new Date();
	n = c_date.getTime() + 1000*60*60*24*7; //期限は一週間
	c_date.setTime(n);
	kigen = c_date.toGMTString();

	//cookieの読み込み
	s = document.cookie;
	//有効なcookie名を調べる
	cn = "linkurl=";
	//有効なcookieがあるか判断

	
	if(s.indexOf(cn) == -1) document.cookie = cn + linkurl + "; expires=" + kigen;