FlyingCircus.Validators.notNull = function notNull(value) {
    if (value === null)
        return 'Value is mandatory';
}


FlyingCircus.Validators.hasLength = function hasLength(value) {
    if (value === null || value.length == 0)
        return 'Value is mandatory';
}


FlyingCircus.Validators.validEmail = function validEmail(email) {
    var regex = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;
    if (!regex.test(email))
        return 'Must be a valid e-mail address'
}