function textCounter(textFieldID, counterFieldID, maxChars)
{
  var textField = document.getElementById(textFieldID);
  var counterField = document.getElementById(counterFieldID);
  
  if (textField.value.length > maxChars)
  {
    textField.value = textField.value.substring(0, maxChars);
  }
  else
  {
    counterField.value = maxChars - textField.value.length;
  }
}