// Textarea text counter to limit the field length
function textBoxCounter(textAreaInput, counterDisplayId, maxTextLength)
{
    if (textAreaInput.value.length > maxTextLength)
    {
        // if too many characters are in the field remove the excess!
        textAreaInput.value = textAreaInput.value.substring(0, maxTextLength);
    }
    else
    {
        // if the user has characters remaining update the counter to show how many.
        document.getElementById(counterDisplayId).innerHTML = maxTextLength - textAreaInput.value.length;
    }
}