function validate(formNode){
  var formValidatorInstance = new FormValidator(formNode);
  formValidatorInstance.addRule('name','We need a name to reply properly','required');
  formValidatorInstance.addRule('email','We need a valid email address with which to reply','email');
  formValidatorInstance.addRule('postcode','That is not a valid UK postcode','expression',/^([A-Pa-pR-Ur-uWYZwyz0-9][A-Ha-hK-Yk-y0-9][AEHMNPRTVXYaehmnprtvxy0-9]?[ABEHMNPRVWXYabehmnprvwxy0-9]? ?{1,2}[0-9][ABabD-Hd-hJLjlN-Un-uW-Zw-z]{2}|GIR ?0AA|g1r ?0aa)$/);
  formValidatorInstance.addRule('message','You seem to have forgotten the message','required');
  return formValidatorInstance.validate(); 
}