Code
<br><progress id='jeuwu27' value="0" max="$MAX_MESSAGE_LEN$" style="margin-top:-10px;width:98%;height:15px;"></progress>
<script>function countMessLength(){
var rstz = $('#mchatMsgF').val().length;if (rstz<0){rstz=0;$('#mchatMsgF').val($('#mchatMsgF').val().substr(0,$MAX_MESSAGE_LEN$));}$('#jeuwu27').attr('value',rstz)
var rst = $MAX_MESSAGE_LEN$-$('#mchatMsgF').val().length;if (rst<0){rst=0;$('#mchatMsgF').val($('#mchatMsgF').val().substr(0,$MAX_MESSAGE_LEN$));}$('#jeuwu28').html(rst);}
</script>