JS记录用户登录次数的代码

用js记录用户的登录次数：
当登录次数达到三次，就自动调用函数，隐藏弹出框。
代码如下:

function www_helpor_net(offset) { 
var endstr = document.cookie.indexOf(";", offset); 
if (endstr == -1) 
endstr = document.cookie.length; 
return unescape(document.cookie.substring(offset, endstr)); 
} 
function GetCookie(name) { 
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 www_helpor_net(j); 
i = document.cookie.indexOf(" ", i) + 1; 
if (i == 0) 
break; 
} 
return null; 
} 
//设置cookie值
function SetCookie(name, value) { 
var argv = SetCookie.arguments; 
var argc = SetCookie.arguments.length; 
var expires = (2 < argc) ? argv[2] : null; 
var path = (3 < argc) ? argv[3] : null; 
var domain = (4 < argc) ? argv[4] : null; 
var secure = (5 < argc) ? argv[5] : false; 
document.cookie = name 
+ "=" 
+ escape(value) 
+ ((expires == null) ? "" : ("; expires=" + expires 
.toGMTString())) 
+ ((path == null) ? "" : ("; path=" + path)) 
+ ((domain == null) ? "" : ("; domain=" + domain)) 
+ ((secure == true) ? "; secure" : ""); 
} //  www.jbxue.com 脚本学堂
var expdate = new Date(); 
var visits; 
expdate.setTime(expdate.getTime() + (24 * 60 * 60 * 1000 * 365)); //设置COOKIES时间为1年,自己随便设置该时间 
if (!(visits = GetCookie("visits"))) { 
visits = 0; 
} 
var oldjessionid = GetCookie("OLDJSESSIONID"); 
if (!oldjessionid) { 
oldjessionid = "111"; 
} 
var newjessionid = GetCookie("JSESSIONID"); 
if (oldjessionid != newjessionid) { 
visits++; 
SetCookie("OLDJSESSIONID", newjessionid, expdate, "/", null, false); 
SetCookie("visits", visits, expdate, "/", null, false); 
} 

//以下信息显示可以使用标准的HTML语法,自己随便设置 
document.write("你已经光临本页" + "<FONT COLOR=red>" + visits + "</FONT>"+ "次！"); 

//当登录次数达到三次，就自动调用函数，隐藏弹出框，如果只要记录登录次数，下边代码可以忽略 
if (visits > 3) { 
setInterval("changeH("down")", 2); 
} */