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    var keyboard = function(window) {
        var keyboard = window.keyboard || {};

        if (!('isPressed' in keyboard)) {
            keyboard._keys = {};

            var handler = function(e, flag) {
                var key = String.fromCharCode(e.which).toLowerCase();

                keyboard._keys[key] = flag;
            }

            $(document).on('keypress', handler, true).
                on('keyup', handler, false);

            keyboard.isPressed = function(key) {
                key = key.toLowerCase();

                if (key in keyboard._keys) {
                    return keyboard._keys[key];
                }

                return false;
            }
        }

        return keyboard;
    }(window);