(function ($, undefined) {
    "use strict";
    var blink = function (obj, durationOut, durationIn) {
        $(obj).animate({ opacity: 0.1 }, durationOut, 'linear', function () {
            $(obj).animate({ opacity: 1 }, durationIn, 'linear', function () {
                if ($(this).hasClass('blink')) { blink(obj, durationOut, durationIn); }
            });
        });
    };
    $.fn.blink = function (durationOut, durationIn) {
        if (durationOut !== undefined) {
            if (durationIn === undefined) { durationIn = durationOut; }
            return this.each(function () {
                $(this).addClass('blink');
                blink(this, durationOut, durationIn);
            });
        } else {
            return this.each(function () {
                $(this).removeClass('blink').stop(true).css('opacity', 1);
            });
        }
    };
}(jQuery));