Add easing to the thumnails?

Hello, i recently completed the “Learn how to add thumbnails to the XML PhotoGallery” tutorial, and i was wondering how i could use easing to make the action on the thumnails smoother? I already got screamed at once for posting a question without searching for answers on my own, but i really dont have to much opportunity to search through all the forums during work…Does anyone have any suggestions?

Thanks