var request = false;
var isLogin = false ;
//创建XMLHttpRequest对象
function createRequest() {
	try {
		request = new XMLHttpRequest();
	} catch (trymicrosoft) {
		try {
			request = new ActiveXObject("Msxml2.XMLHTTP");
		} catch (othermicrosoft) {
			try {
				request = new ActiveXObject("Microsoft.XMLHTTP");
			} catch (failed) {
				request = false;
			}
		}
	}
}
//发送请求
function send_submit(url,back) {
	createRequest() ;
	request.open("GET", url, true);
	request.onreadystatechange = back;
	request.send(null);
}

//登录
function login() {
	if(check_input()){
	var username = document.getElementById("username").value;
	var password = document.getElementById("password").value;
	var url =  "/login.jsp?username="+username+"&password="+password+"&randnum="+Math.random();
	send_submit(url,loginBack);
	}
}

//回调函数
function loginBack() {
	if (request.readyState == 4) {
		if (request.status == 200) {
			var response = request.responseText ;
			myArray=response.split("|");
			if (response.indexOf("success") > 0){
var innerStr = "";
innerStr = "<div id='login_enter'>欢迎您，尊敬的会员：<span>"+myArray[1]+"</span></div>";
innerStr = innerStr + "<div class='forget'><img src='images/top/glzx.gif' /></div>";
innerStr = innerStr + "<div class='forget'><img src='images/top/exit.gif' onclick='logout()' /></div>";
innerStr = innerStr + "<div class='forget'><a href='bottomlink/huiyuan.jsp'>[会员服务]</a></div>";
innerStr = innerStr + "<div class='forget'><a href='bottomlink/aboutus.jsp'>[关于我们]</a></div>";
innerStr = innerStr + "<div class='forget'><a href=\"javascript:window.external.addFavorite('http://www.mtklw.com.cn/','中国媒体广告刊例网');\">[加入收藏]</a></div>";
document.getElementById("login").innerHTML = innerStr;
			}
			if (response.indexOf("delete") > 0){
				alert("用户被管理员删除");
			}
			if (response.indexOf("error") > 0){
				alert("用户名或密码错误");
			}
			if (response.indexOf("inexistence") > 0){
				alert("用户名不存在");
			}
		} else {
			document.getElementById("message_flag").innerHTML = "留言发送失败！" ;
			alert("直接失败");
		}
	}
}

//退出
function logout() {
	var url =  "/logout.jsp?&randnum="+Math.random();
	send_submit(url,logoutBack);
}
//退出回调函数
function logoutBack() {
	var innerStr = "";
	innerStr = "<div class='name'><img src='images/top/yh.gif' width='36' height='21' /></div>";
	innerStr = innerStr + "<div class='text'><input name='username' id='username' type='text' size='15' class='input_style' /></div>";
	innerStr = innerStr + "<div class='name'><img src='images/top/mm.gif' width='36' height='21' /></div>";
	innerStr = innerStr + "<div class='text'><input name='password' id='password' type='password' size='15' class='input_style' /></div>";
	innerStr = innerStr + "<div class='forget'><img src='images/top/dl.gif' onclick='login()' /></div>";
	innerStr = innerStr + "<div class='forget'><a href='bottomlink/huiyuan.jsp'><img src='images/top/ljjr.gif' width='75' height='20' border='0' /></a></div>";
	innerStr = innerStr + "<div class='forget'><a href='#'>忘记密码</a></div>";
	innerStr = innerStr + "<div class='forget'><a href='bottomlink/huiyuan.jsp'>[会员服务]</a></div>";
	innerStr = innerStr + "<div class='forget'><a href='bottomlink/aboutus.jsp'>[关于我们]</a></div>";
	innerStr = innerStr + "<div class='forget'><a href=\"javascript:window.external.addFavorite('http://www.mtklw.com.cn/','中国媒体广告刊例网');\">[加入收藏]</a></div>";
	document.getElementById("login").innerHTML = innerStr;
}

//判读登录输入
function check_input(){
	if(document.getElementById("username").value == ""){
		alert("请填写用户名");
		return false;
	}
	else{
		if(document.getElementById("password").value == ""){
			alert("请填写密码");
			return false;
		}
		else{
			return true;
		}
	}
}