// JavaScript Document
function AddCookie(name,value)
{ 
     document.cookie= name+"=" + escape(value);
}



function DelCookie(name)
{
	var expires = new Date();
		 expires.setTime(expires.getTime()-1);    
		 document.cookie= name+"=;expires=" + expires.toGMTString();
}


function ReadCookie(name)
{
	var cookieString = document.cookie;
	var start = cookieString.indexOf(name + '='); 
	if (start == -1)
	return null;
	start += name.length + 1;
	var end = cookieString.indexOf(';', start);
	if (end == -1) return unescape(cookieString.substring(start));
	return unescape(cookieString.substring(start, end));
}

function SetCookie(name,value)
{
    var Days = 30; //此 cookie 将被保存 30 天
    var exp = new Date();    //new Date("December 31, 9998");
    exp.setTime(exp.getTime() + Days*24*60*60*1000);
    document.cookie = name + "="+ escape (value) + ";expires=" + exp.toGMTString();
}