function CheckMaxLength(e, textarea_id, max)
{
    var theTextArea = document.getElementById(textarea_id);
    if (!e.which)
    {
        keyCode = event.keyCode; // ie5+ op5+
    }
    else
    {
        keyCode = e.which; // nn6+
    }

    if (theTextArea.value.length>max)
    {
        theTextArea.value = theTextArea.value.substring(0, max);
    }
}