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<script>function countMessLength(){
var rstz = $('#mchatMsgF').val().length;if (rstz<0){rstz=0;$('#mchatMsgF').val($('#mchatMsgF').val().substr(0,500));}$('#jeuwu27').attr('value',rstz)
var rst = 500-$('#mchatMsgF').val().length;if (rst<0){rst=0;$('#mchatMsgF').val($('#mchatMsgF').val().substr(0,500));}$('#jeuwu28').html(rst);}
</script>