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jQuery fadeIn event?
$('elements').delegate('selector', 'fadeInEvent', function() {
    alert('someId has faded in');
});

$('#someId').fadeIn('fast', function() {
    alert('callback when someId has faded in');
});

$("#someId").fadeIn("fast", function() {
    $(this).trigger("fadeInComplete");
});

$("#someAncestor").on("fadeInComplete", function() {
    //Element has finished fading in.
});

(function($) {
  var jQueryFadeIn = $.fn.fadeIn;
  var newFadeIn = function(speed, callback) {
    var newCallback = function() {
        if (callback) {
            callback.apply(this, arguments);
        }
        $(this).trigger('fadeInComplete');
    };
    jQueryFadeIn(speed, newCallback);
  };
  $.fn.fadeIn = newFadeIn;
})(window.jQuery);