function unvalidate(myValidationGroup) {
  var myValidators = Page_Validators;
  if ((typeof(myValidators) != "undefined") && (myValidators != null)) {
    for (i=0;i<myValidators.length;i++) {
      var myValidator = myValidators[i];
      if (myValidationGroup == null || IsValidationGroupMatch(myValidator, myValidationGroup)) {
        if (myValidator.style.visibility.length > 0 && myValidator.style.display.length == 0) {
          myValidator.style.visibility = 'hidden';
        } else if (myValidator.style.display.length > 0 && myValidator.style.visibility.length == 0) {
          myValidator.style.display = 'none';
        }
      }
    }
  }
}