function ShowCommentPreview(textbox) {
            var message = textbox.value;
            //message = message.replace("\r\n", "<br /><br />");
            //message = message.replace("\r", "<br />");
            message = message.replace("\n", "<br />");
            var div = document.getElementById("commentPreview");
            div.innerHTML = message;
        }
        
        function ValidateMessage(sender, args) {
            var textbox = document.getElementById(sender.controltovalidate);
            if ( textbox.value.length <= 10000 ) {
                args.IsValid = true;
            } else {
                args.IsValid = false;
            }
        }