$(document).ready(function(){
 $.fn.wait = function(time, type) {
        time = time || 250;
        type = type || "fx";
        return this.queue(type, function() {
            var self = this;
            setTimeout(function() {
                $(self).dequeue();
            }, time);
        });
    };
    function runIt() {
      $(".blink").wait()
              .animate({"opacity": 0},500)
              .wait()
              .animate({"opacity": 1},2500,runIt);
    }
    runIt();
});