Custom jquery validate

jQuery.validator.addMethod("checkForExistEmail", function (value, element, param) {

    var ajaxFunc = $.ajax({
        async: false,
        data: { emailValidate: value },
        type: 'POST',
        url: '/url?c=checkEmailExist',
        dataType: 'json'
    });
    if (ajaxFunc.responseText == 1)
        return true;
    else
        return false;
}, "This email exist. Please choose another email address");

jQuery.validator.addMethod("checkForEmail", function (value, element, param) {

    var re = /^(([^<>()[\]\\.,;:\s@\"]+(\.[^<>()[\]\\.,;:\s@\"]+)*)|(\".+\"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/;
    return re.test(value);
}, "Please enter a valid email address.");