function limitText(textareaObj,maxLength){
  if (textareaObj.value.length>maxLength) {
    textareaObj.value=textareaObj.value.substring(0,maxLength)	
  }
}

function setAnonymity(chkbox) {
  var fbUserName = document.getElementById('fbUserName');
  var name = document.getElementById('name');
  var street = document.getElementById('street');
  var postcode = document.getElementById('postcode');
  var postarea = document.getElementById('postarea');
  var email = document.getElementById('email');
  var phone = document.getElementById('phone');
  var replymessage = document.getElementById('replymessage');

  var disabledSetting = (chkbox.checked) ? "true" : "";
  var displaySetting = (chkbox.checked) ? "none" : "";

  if (fbUserName) {
    fbUserName.style.display = displaySetting;
  } else {
    name.value = "";
    name.disabled = disabledSetting;
    street.value = "";
    street.disabled = disabledSetting;
    postcode.value = "";
    postcode.disabled = disabledSetting;
    postarea.value = "";
    postarea.disabled = disabledSetting;
    email.value = "";
    email.disabled = disabledSetting;
    phone.value = "";
    phone.disabled = disabledSetting;
  }

  replymessage.checked = "";
  replymessage.disabled = disabledSetting;
}