function login() {

    var email = $("#txtLoginName").val(); //document.getElementById("txtLoginName").value;
    var password = $("#txtPwd").val(); //document.getElementById("txtPwd").value;
    var preurl = $("Login1_HiddenField1").val(); //document.getElementById("Login1_HiddenField1").value
    var dtime = new Date();
    $.ajax
                ({
                    type: "Get",
                    url: '/Ajax.ashx',
                    data: "type=login&email=" + email + "&password=" + password + "&preurl=" + preurl + "&dtime=" + dtime,
                    success: function(data) {
                        if (data == "loginsuccess1") {
                            document.location.href = preurl;
                        }
                        else if (data == "loginsuccess2") {
                            document.location.href = "/Default.aspx";
                        }
                        else if (data == "faliure1") {
                            alert("对不起，您的账户处于尚未被激活的状态，请通过注册邮箱中的邮件激活！！");
                            document.getElementById("txtLoginName").focus();
                            return false;
                        }
                        else if (data == "faliure2") {
                            alert("用户名或密码错误！");
                            document.getElementById("txtLoginName").focus();
                            return false;
                        }
                    },
                    error: function(data, status, e) {
                        alert(data);
                    }
                });
            }

            function loginkeydown(e) {
                if (e.keyCode == 13) {
                    login();
                }
            }