$(document).ready(function() {
    var $form = $('#loginForm').submit(function() {
        var $username = $('#username');
        var username = $.trim($username.val());
        var $password = $('#password');
        var password = $.trim($password.val());
        var valid = true;
        if (username == '') {
            valid = false;
            $username.effect("highlight", { color: '#800517' }, 1000);
        }
        if (password == '') {
            valid = false;
            $password.effect("highlight", { color: '#800517' }, 1000);
        }
        if (valid) {
            var $btn = $('#btnLogin');
            $btn.after($loadingImg).hide();
            $.post($form.attr("action"), $form.serialize(), function(json) {
                if (json.loggedIn)
                    window.location = $.getQueryString({ id: "ReturnUrl", defaultvalue: "/Admin/News" });
                else {
                    alert(json.infoMsg);
                    $btn.show().next().remove();
                }
            }, "json");
        }
        return false;
    });
});