//获取并返回与 cookieName 同名的 cookie 名称，允许大小写不同 
//如果不存在这样的 cookie，就返回 cookieName 
function ResponseCookies_GetCookieName(cookieName) { 
	var lowerCookieName = cookieName.toLowerCase(); 
	var cookieStr = document.cookie; 

	if (cookieStr == "") { 
		return cookieName; 
	} 

	var cookieArr = cookieStr.split("; "); 
	var pos = -1; 
	for (var i=0; i<cookieArr.length; i++) { 
		pos = cookieArr[i].indexOf("="); 
		if (pos > 0) { 
			if (cookieArr[i].substring(0, pos).toLowerCase() == lowerCookieName) { 
				return cookieArr[i].substring(0, pos); 
			}
		}
	}
	return cookieName; 
}

//获取并返回 cookie 值 
//不区分 cookieName 的大小写 
//dfltValue 为默认返回值 
//不考虑子键 
function RequestCookies(cookieName, dfltValue) { 
	var lowerCookieName = cookieName.toLowerCase(); 
	var cookieStr = document.cookie; 

	if (cookieStr == "") { 
		return dfltValue; 
	} 

	var cookieArr = cookieStr.split("; "); 
	var pos = -1; 
	for (var i=0; i<cookieArr.length; i++) { 
		pos = cookieArr[i].indexOf("="); 
		if (pos > 0) { 
			if (cookieArr[i].substring(0, pos).toLowerCase() == lowerCookieName) { 
				return unescape(cookieArr[i].substring(pos+1, cookieArr[i].length)); 
			}
		} 
	} 

	return dfltValue; 
}