Blog

<textarea name="companyDescription" maxlength="2000" id="companyDescription" rows="10" cols="30" onkeyup="countDown(this);"></textarea>

<div id="countDownValue"></div>

      function countDown (obj){
            var element = document.getElementById("countDownValue");
            var maxLength = obj.maxLength;
            element.innerHTML="Allowed characters remaining "+(maxLength-obj.value.length);
          }