function CheckStr(srcStr){
    var dstStr;
    dstStr = srcStr;
    dstStr = dstStr.replace(/</g, "<");
    dstStr = dstStr.replace(/>/g, ">");
    dstStr = dstStr.replace(/&/g, "&");
    return dstStr;
}

function TryThese(){
    for (i = 0; i < arguments.length; i++){
        try{
            return arguments[i]();
        }catch(e){}
    }
    return false;
}

function CreateXMLHTTP(){
    return TryThese(
        function() {return new ActiveXObject("Msxml2.XMLHTTP");},
        function() {return new ActiveXObject("Microsoft.XMLHTTP");},
        function() {return new XMLHttpRequest();}
    ) || false;
}

function NoXMLHTTP(){
    alert("Sorry, your browser doesn't support XMLHTTP");
}

//ajax登陆    

function AJAXLogin(){
    var username, password, KeepLogin,validate; 
        username=document.userLogin.username.value;
        password=document.userLogin.password.value;
        KeepLogin=document.userLogin.KeepLogin.options[document.userLogin.KeepLogin.selectedIndex].value;
        validate=document.userLogin.validate.value
    if (username == ""){    
        alert("用户名不能为空哦，请输入！");    
        return false;    
    } 
    if (password == ""){    
        alert("没有密码是不能登陆的哟！");    
        return false;    
    } 
        var url="ajaxLogin.asp"
        var param;
    param = "action=login";    
    param += "&username=" + username;    
    param += "&password=" + password;    
    param += "&AJAXKeepLogin=" + KeepLogin;
	param += "&validate=" + validate;
    document.getElementById("AJAXMsg").innerHTML = "<br>登录中，请稍候……"; 
    var xmlHTTP = CreateXMLHTTP();
    if (xmlHTTP){
        xmlHTTP.onreadystatechange = function()
        {
            if (xmlHTTP.readyState == 4 && xmlHTTP.status == 200){  
                    if (xmlHTTP.responseText == "登录成功"){    
                        window.location.reload();
                    }else{    
                    document.getElementById("AJAXMsg").innerHTML =xmlHTTP.responseText;    
                    }
            }
        }
        xmlHTTP.open("post", url, true);
        xmlHTTP.setRequestHeader("Content-Length",param.length); 
        xmlHTTP.setRequestHeader("CONTENT-TYPE","application/x-www-form-urlencoded");
        xmlHTTP.send(param);    
    }else{
        NoXMLHTTP();
    } 
}    
   
function AJAXLogout(){ 
        var url="ajaxLogin.asp"
    var param;    
    param = "action=logout";    
    var xmlHTTP = CreateXMLHTTP();
    if (xmlHTTP){
        xmlHTTP.onreadystatechange = function()
        {
            if (xmlHTTP.readyState == 4 && xmlHTTP.status == 200){   
                        window.location.reload();
            }
        }
        xmlHTTP.open("post", url, true);
        xmlHTTP.setRequestHeader("Content-Length",param.length); 
        xmlHTTP.setRequestHeader("CONTENT-TYPE","application/x-www-form-urlencoded");
        xmlHTTP.send(param);    
    }else{
        NoXMLHTTP();
    } 
}