Простая игра на развитие навыков печати

<div id="toolbar">
  <div id="boxscore">
    <span>Score:</span>&nbsp;<span id="score">0</span>
  </div>
  <div id="boxcontrol">
    <a href="/" id="btnplay">Играть</a>
  </div>
</div>
<div id="container">
  <div class="animatedbox">
      <span class="match"></span><span class="unmatch"></span>
  </div>
  <div class="animatedbox">
      <span class="match"></span><span class="unmatch"></span>
  </div>
</div>

var arrstring = new Array("изображение", "обои", "фотография", "вектор",
    "дизайнер", "запрос", "данные", "поле", "скрипт", "блог", 
    "поиск", "закладка", "символ", "код", "сервер", "сеть",
    "графика", "вектор", "тег", "список", "страница", "меню",
    "мобильный", "оптимизация", "интерфейс", "кнопка", "элемент", "выбор",
    "колбаса", "сыр", "мясо");

    function randomFromTo(from, to){
        return Math.floor(Math.random() * (to - from + 1) + from);
    }
	
    var score = 0;

    $(document).ready(function() {

        var children = $("#container").children();
        var child = $("#container div:first-child");

        var currentEl;
        var currentElPress;

        var win_width = $(window).width();
        var text_move_px = 500;
        var box_left = (win_width / 2) - (text_move_px / 2);

        var playGame;
        var stop;
        
        $(".animatedbox").css("left", box_left+"px");

        $("#btnplay").click(function() {

            if ($(this).text() == "Играть") {
                startPlay();
                playGame = setInterval(startPlay, 23000);
                $(this).text("Закончить");
            } else if ($(this).text() == "Закончить") {
                stop = true;
                if ($("#container").find(".current").length == 0) {
                  $(this).text("Играть");
                } else {
                  $(this).text("Подождите...");
                }
                clearInterval(playGame);
            }
            return false;
        });

        var con_height = $("#container").height();
        var con_pos = $("#container").position();
        var min_top = con_pos.top;

        // 56 = отступ анимированного прмяоугольника сверху и снизу + размер шрифта
        var max_top = min_top + con_height - 56;

        function startPlay() {

            child = $("#container div:first-child");
            child.addClass("current");
            currentEl = $(".current");
            
            for (i=0; i<children.length; i++) {
                var delaytime = i * 3500;
                setTimeout(function() {
                    randomIndex = randomFromTo(0, arrstring.length - 1);
                    randomTop = randomFromTo(min_top, max_top);
                    child.animate({"top": randomTop+"px"}, 'slow');
                    child.find(".match").text("");
                    child.find(".unmatch").text(arrstring[randomIndex]);
                    child.show();
                    child.animate({
                       left: "+="+text_move_px
                    }, 8000, function() {
                        currentEl.removeClass("current");
                        currentEl.fadeOut('fast');
                        currentEl.animate({
                            left: box_left+"px"
                        }, 'fast');
                        if (currentEl.attr("id") == "last") {
                            child.addClass("current");
                            currentEl = $(".current");
                            if (stop) {
                               $("#btnplay").text("Играть");
                            }
                        } else {
                            currentEl.next().addClass("current");
                            currentEl = currentEl.next();
                        }
                    });
                    child = child.next();
                }, delaytime);
            }            
        }

        // В IE $(window).keypress() не работает
        $(document).keypress(function(event) {
            currentElPress = $(".current");
            
            var matchSpan = currentElPress.find(".match");
            var unmatchSpan = currentElPress.find(".unmatch");
            var unmatchText = unmatchSpan.text();
            var inputChar;

            if ( $.browser.msie || $.browser.opera ) {
                inputChar = String.fromCharCode(event.which);
            } else {
                inputChar = String.fromCharCode(event.charCode);
            }

            if (inputChar == unmatchText.charAt(0)) {
                unmatchSpan.text(unmatchText.replace(inputChar, ""));
                matchSpan.append(inputChar);
                if (unmatchText.length == 1) {
                    currentElPress.stop().effect("explode", 500);
                    currentElPress.animate({
                        left: box_left+"px"
                    }, 'fast');
                    if (currentElPress.attr("id") == "last" && stop) {
                        $("#btnplay").text("Играть");
                    }

                    currentElPress.removeClass("current");
                    currentElPress = currentElPress.next();
                    currentElPress.addClass("current");
                    currentEl = currentElPress;
                    score += 50;
                    $("#score").text(score).effect("highlight", { 
                        color: '#000000'
                    }, 1000);
                } else {
                    score += 10;
                    $("#score").text(score);
                }
            }
        });
	});

* {
    font-family: Arial;
}
#container {
    background: #333;
    width: 500px;
    height: 230px;
    margin: 0 auto;
    -webkit-border-radius: 0.7em;
    -moz-border-radius: 0.7em;
    border-radius: 0.7em;
    padding: 20px 0;
}
.animatedbox {
    background: #ff0084;
    position: absolute;
    padding: 8px 20px 12px 15px;
    font-size: 36px;
    color: #ffffff;
    -webkit-border-radius: 0.5em 2.5em 2.5em 0.5em;
    -moz-border-radius: 0.5em 2.5em 2.5em 0.5em;
    border-radius: 0.5em 2.5em 2.5em 0.5em;
    left: 500px;
    letter-spacing: 3px;
    display: none;
}
.match {
    color: #000000;
}
.current {
    background: #0099cc;
}
#toolbar {
    background: #ff0084;
    -webkit-border-radius: 1.0em;
    -moz-border-radius: 1.0em;
    border-radius: 1.0em;
    width: 500px;
    padding: 10px 0 10px 0;
    margin: 0 auto;
    text-align: center;
    margin-bottom: 10px;
    margin-top: 10px;
}
#boxscore {
    float: left;
    font-size: 22px;
    margin-left: 15px;
    color: #ffffff;
}
#score {
    font-weight: bold;
    font-size: 24px;
    padding: 0 3px;
}
#boxcontrol {
    float: right;
    margin-right: 15px;
}
#boxcontrol a {
    font-size: 22px;
    color: #ffffff;
}
.clear {
    margin-top: 5px;
    font-size: 11px;
    font-weight: bold;
    color: #ffffff;
    clear: both;
}