Flashing text on value change [duplicate]

Question

Hi i have a snippet of javascript/JQuery that is reading from a and putting the values in to corresponding div's what i want to know is with what i currently have would it be possible to detect when the value has changed and flash the text or background or something along those lines, here is my code.

       $(document).ready(
    function () {
        setInterval(function () {
            $.getJSON("../../../UpdatedData/MachineCounts/MachineCounts.json", function (data) {
                $(".Midbox").empty().removeClass("YellowBackground").removeClass("redBackground");

                $.each(data, function (key, val) {
                    var DID = "#" + val.controllerID + "D";
                    var NID = "#" + val.controllerID + "N";
                    var DSID = "#" + val.controllerID + "DS";
                    var NSID = "#" + val.controllerID + "NS";


                    var DayScrapPercent = val.ScrapCountDay / val.GoodCountDay * 100;
                    var NightScrapPercent = val.ScrapCountNight / val.GoodCountNight * 100;

                    if (isNaN(DayScrapPercent) == true) {
                        DayScrapPercent = 0;
                    }

                    if (isNaN(NightScrapPercent) == true) {
                        NightScrapPercent = 0;
                    }

                    var DayClass = "";
                    var NightClass = "";


                    if (DayScrapPercent > 3) {
                        DayClass = "yellowBackground";
                    } else if (DayScrapPercent > 5) {
                        DayClass = "redBackground";
                    }

                    if (NightScrapPercent > 3) {
                        NightClass = "yellowBackground";
                    } else if (NightScrapPercent > 5) {
                        NightClass = "redBackground";
                    }

                    $(DID).empty();
                    $(DID).append(Math.abs(val.GoodCountDay)).addClass(DayClass);
                    $(NID).empty();
                    $(NID).append(Math.abs(val.GoodCountNight)).addClass(NightClass);

                    $(DSID).empty();
                    $(DSID).append(Math.abs(DayScrapPercent) + "%");
                    $(NSID).empty();
                    $(NSID).append(Math.abs(NightScrapPercent) + "%");

                });
            });
        }, 5000);
    });

when this looks wit puts data in to divs the data is just numbers, what i need to do is detect when those numbers change and if they have changed flash when they change.