function saveCookie(name, value, expires, path, domain, secure){
	var strCookie = name + "=" + value;
	if (expires){
		// 计算Cookie的期限, 参数为天数
		var curTime = new Date();
		curTime.setTime(curTime.getTime() + expires*24*60*60*1000);
		strCookie += "; expires=" + curTime.toGMTString();
	}
	// Cookie的路径
	strCookie += (path) ? "; path=" + path : "";
	// Cookie的Domain
	strCookie += (domain) ? "; domain=" + domain : "";
	// 是否需要保密传送,为一个布尔值
	strCookie += (secure) ? "; secure" : "";
	document.cookie = strCookie;
}

function getCookie(name){// 使用名称参数取得Cookie值, null表示Cookie不存在
	var strCookies = document.cookie;
	var cookieName = name + "="; // Cookie名称
	var valueBegin, valueEnd, value;
	// 寻找是否有此Cookie名称
	valueBegin = strCookies.indexOf(cookieName);
	if (valueBegin == -1) return null; // 没有此Cookie
	// 取得值的结尾位置
		valueEnd = strCookies.indexOf(";", valueBegin);
	if (valueEnd == -1)
		valueEnd = strCookies.length; // 最後一个Cookie
	// 取得Cookie值
	value = strCookies.substring(valueBegin+cookieName.length,valueEnd);
	return value;
}

function checkCookieExist(name){
	if (getCookie(name))
		return true;
	else
		return false;
}

function deleteCookie(name, path, domain){
	var strCookie;
	// 检查Cookie是否存在
	if (checkCookieExist(name)){
		// 设置Cookie的期限为己过期
		strCookie = name + "=";
		strCookie += (path) ? "; path=" + path : "";
		strCookie += (domain) ? "; domain=" + domain : "";
		strCookie += "; expires=Thu, 01-Jan-70 00:00:01 GMT";
		document.cookie = strCookie;
	}
}