Imagetransition for thumbnailgallery

Hi out there,
thanx for the great tut “thumbnailgallery”, works fine.
now i would like to add a transition to the loading images, similiar like in this thread was discussed

with the nice easing transition.

but how to do with the existing script of the thumbnailgallery???
ok, what I need are two instances for the loading images.
one for the first image keep running, while the next image is pointed to load.

but how could i switch between?
is there anybody able to help me to understand how i could fix this problem?

sorry for my bad english and the stupid question, I just try to learn