怎么扩展Jquery表单验证？

项目中用到的Jquery表单验证
function FormValidator() {
        $("#frmContent").validate({
            rules: {
                CUSTOMERNAME: {
                    required: true,
                    maxlength: 20
                },
                CERTIFICATENUM:
                {
                    required: true,
                    maxlength: 20,
                    digits: true
                },
                CURRENTORGFULLCODE: {
                    required: true
                },
                SOCIALSECUIRTYNUM: {
                    digits: true
                },
                BANKCARDID: {
                    digits: true,
                    rangelength: [16, 19]
                }
            },
            messages: {
                CUSTOMERNAME: {
                    required: "请输入会员姓名",
                    maxlength: "会员姓名长度不能超过20"
                },
                CERTIFICATENUM: {
                    required: "请输入证件号",
                    maxlength: "证件号长度不能超过20",
                    digits: "证件号必须为整数"
                },
                CURRENTORGFULLCODE: {
                    required: "请输入单位编号"
                },
                SOCIALSECUIRTYNUM: {
                    digits: "社保号必须为整数"
                },
                BANKCARDID: {
                    digits: "银行卡号必须为整数",
                    rangelength: "银行卡号应为16或19位整数"
                }
            },
            errorPlacement: function (error, element) {
                error.appendTo(element.next());
            },
            submitHandler: function (form) {               
                return false;
            }
        });       
    }
现在想扩展 加入邮箱验证，
最后的效果：function FormValidator() {
        $("#frmContent").validate({
            rules: {
                Email: {
                    IsEmail:true,
                    required: true,
                    maxlength: 20
                },
                CERTIFICATENUM:
                {
                    required: true,
                    maxlength: 20,
                    digits: true
                }
               },
            messages: {
                Email: {
                    isEmail:"邮箱格式错误,正确格式如下:[email protected]"
                    required: "请输入会员姓名",
                    maxlength: "会员姓名长度不能超过20"
                },
                CERTIFICATENUM: {
                    required: "请输入证件号",
                    maxlength: "证件号长度不能超过20",
                    digits: "证件号必须为整数"
                },
           },
            errorPlacement: function (error, element) {
                error.appendTo(element.next());
            },
            submitHandler: function (form) {               
                return false;
            }
        });