function displayScoreMessage() {
    if (scoremessages[0]) {
        if (scoremessages[0] == flagwin) {      // Win game
            showResultMessage("success");
        } else {
            score = score + Number(scoremessages[0]);
            document.getElementById("scoreboard").innerHTML = 'Current Score: ' + score;
            if (score < -10) {                  // Lose game
                showResultMessage("fail");
            }
        }
        scoremessages.shift();
    }
    myTimeoutMessage = setTimeout(displayScoreMessage, 250); // 0.1 second
}

function CalculateScore(action) {

    if (action == 'c') {            // correct
        timedecreasing = 0;
        scoremessages.push("10");
    } else if (action == 'r') {      // wrong
        timedecreasing = 0;
        scoremessages.push("-5");
    } else if (action == 'w') {      // win
        timedecreasing = 0;

        var dtObj = new Date();
        dtGameEnd = dtObj.getTime();
        totalTime = dtGameEnd - dtGameStart;

        var bonus = 0;
        if (totalTime < 5000) {    // 5 sn
            bonus = 300;
        } else if (totalTime < 10000) {    // 10 sn
            bonus = 130;
        } else if (totalTime < 20000) {    // 20 sn
            bonus = 60;
        } else if (totalTime < 30000) {    // 30 sn
            bonus = 22;
        } else if (totalTime < 40000) {    // 40 sn
            bonus = 10;
        } else if (totalTime < 50000) {    // 50 sn
            bonus = 4;
        } else if (totalTime < 60000) {    // 60 sn
            bonus = 1;
        }

        scoremessages.push("50");	// completion points
        scoremessages.push(bonus);	// bonus
        PlayBonus();
    } else if (action == 'i') {      // init
        timedecreasing = 1;
    } else {
        if (timedecreasing == 1) {
            scoremessages.push("-1");
        }
        //var dtObj = new Date();
        //dtGameStart = dtObj.getTime();
        //dtLastCorrectAction = dtGameStart;
    }

    if (timedecreasing == 0) {
        timedecreasing = 1;
    }

    clearTimeout(myTimeout); // destroy  timeout
    myTimeout = setTimeout(CalculateScore, 1000); // 1 second
}