var backurl= escape(document.URL);
function $1(obj)
{
    return document.getElementById(obj);
}
function Logout()
{
    document.write("");
    document.location.href="http://www.52letao.com/Logout.aspx?backurl="+backurl;
}
function check_login()
{
    if($1("username").value=="")
    {
        alert("用户名不能为空！");
        $1("username").focus();
        return false;
    }
    if($1("PassWord").value=="")
    {
        alert("用名密码不能为空！");
        $1("PassWord").focus();
        return false;
    }
    $1("letao_loginfrm").action="http://www.52letao.com/Login.aspx?backurl="+backurl;
    $1("letao_loginfrm").submit();
    return true;
}
function get_cookid(sname)
{//获取单个cookies
    var cookies=document.cookie.substring(document.cookie.indexOf("dnt=")+4);
    cookies=cookies.split("&");
    for(var i=0;i<cookies.length;i++)
    {
    var arr=cookies[i].split("=");
        if(sname==arr[0])
        {
            if(arr.length>1)
            return arr[1];
            else
            return "";
        }
    }
    return "";
}
if(document.cookie.indexOf("userid=") == -1)
{
       var tempstr="<label>用户名：</label><label class=\"input\"><input name=\"username\" type=\"text\" id=\"username\" /></label><label>密码：</label><label class=\"input\"><input type=\"password\" name=\"PassWord\" id=\"PassWord\" /></label><label class=\"btn\"><input type=\"submit\" value=\"登录\" onclick=\"check_login()\" /></label>";
       tempstr+="<label class=\"btn\"><a href=\"http://bbs.52letao.com/register.aspx\">注册</a></label>";
	    tempstr+="<label class=\"text\"></label>";
	    tempstr+="<label>|</label>";
		tempstr+="<label class=\"text\"><a href=\"http://bbs.52letao.com\">论坛</a></label>";
       $1("top_nav").innerHTML=tempstr+$1("top_nav").innerHTML;
}
else
{
    var username="";
    username=get_cookid("username");
    if(username=="")
    {
        userid = get_cookid("userid");
        var http_request = false;
        if (window.ActiveXObject) {
                http_request = new ActiveXObject("Microsoft.XMLHTTP");
            }
        else if (window.XMLHttpRequest) {
            http_request = new XMLHttpRequest();
        }
        var geturl="/getUserName.aspx?rnd="+Math.random()+"&userid="+userid;
        http_request.open("GET",geturl, true);
        http_request.onreadystatechange=function()
        {
            if(http_request.readyState==4)
            {
                if(http_request.status==200);
                {
                   username=http_request.responseText;
                    var tempstr="<label>欢迎：</label><label class=\"input\"><font color=red>" + decodeURI(username) + "</font></label>";
                    tempstr+="<label class=\"btn\"><a href=\"javascript:return false;\" onclick=\"Logout()\">退出</a></label>";
	                tempstr+="<label class=\"text\"></label>";
	                tempstr+="<label>|</label>";
		            tempstr+="<label class=\"text\"><a href=\"http://bbs.52letao.com\">进入论坛</a></label>";
		            $1("top_nav").innerHTML=tempstr+$1("top_nav").innerHTML;
//                    $1("top_nav").innerHTML=tempstr+$1("top_nav").innerHTML;
//                    var tempstr="<em> | <a href='http://bbs.52letao.com/register.aspx'  target='_blank'>注册</a> | <a href='/Company/MemberRegister.aspx'  target='_blank'>企业注册</a> | <a href='http://www.52letao.cn/admin/'  target='_blank'>企业登录</a> | <a href='http://www.52letao.com/qingdian/company/adServer.html'  target='_blank'>广告服务</a> | <a href='http://www.52letao.com/qingdian/company/adServer.html'  target='_blank'>客户中心</a></em>"
//	               tempstr+="<i><input type='image' src='/images/button_exit.GIF' width='45' height='21' onclick='Logout()' /></i><span>欢迎：<font color=red>" + decodeURI(username) + "</font>  <a href='http://bbs.52letao.com'><font color='red'>进入论坛</font></a></span>"
//	               tempstr+="<em><a href='http://www.52letao.com/bbs/BlogBBS.aspx' target='_blank'>博客</a> | <a href='http://bbs.52letao.com/' target='_blank'>论坛</a> | </em>";
//                   $1("top_nav").innerHTML=tempstr;
               }
            }
        }
        http_request.send(null);
    }
    else
    {
        var tempstr="<label>欢迎：</label><label class=\"input\"><font color=red>" + decodeURI(username) + "</font></label>";
        tempstr+="<label class=\"btn\"><a href=\"javascript:return false;\" onclick=\"Logout()\">退出</a></label>";
        tempstr+="<label class=\"text\"></label>";
        tempstr+="<label>|</label>";
        tempstr+="<label class=\"text\"><a href=\"http://bbs.52letao.com\">进入论坛</a></label>";
        $1("top_nav").innerHTML=tempstr+$1("top_nav").innerHTML;
    }
}

//<label>用户名：</label><label class="input"><input name="" type="text" /></label><label>密码：</label><label class="input"><input type="password" /></label><label class="btn"><input type="submit" value="登录" /></label>