code: function onImagesLoaded(images, callback){
    var self = this,
        unloaded = images.length;
  
    if (unloaded === 0) {
      callback();
    }
  
    images.each(function(){
      // Check if image is loaded
      if (this.complete && this.naturalWidth !== undefined) {
        singleImageLoaded();
      }
      else {
        // If the above check failed, simulate loading on detached element.
        var image = new Image();
        // Still count image as loaded if it finalizes with an error.
        var events = "load.zf.images error.zf.images";
        $(image).one(events, function me(event){
          // Unbind the event listeners. We're using 'one' but only one of the two events will have fired.
          $(this).off(events, me);
          singleImageLoaded();
        });
        image.src = $(this).attr('src');
      }
    });
  
    function singleImageLoaded() {
      unloaded--;
      if (unloaded === 0) {
        callback();
      }
    }
  }
docs: Runs a callback function when images are fully loaded.
  @param {Object} images - Image(s) to check if loaded.
  @param {Func} callback - Function to execute when image is fully loaded.