jQuery.validator.addMethod("postalcodeNL", function(value, element) {
	return this.required(element) || /^[1-9]{1}[0-9]{3}\s?[A-Z]{2}$/.test(value);
}, "Your ZIP-code is not valid");

jQuery.validator.addMethod("dateNL", function(value, element) {
	return this.required(element) || /^\d{1,2}-\d{1,2}-\d{4}$/.test(value);
}, "Your ZIP-code is not valid");