Here's an example on a site that is doing what I want. The top area of the site has photos that will fade in when you click on a thumbnail at the bottom. However, when you click on a subsequent thumbnail, the picture showing fades out before the next one comes in. So it seems that when you click on a thumbnail, it first plays more of the timeline and fades the photo out before gotoandplay the next fade in. Does this make sense how I am describing it?

http://www.katjaschweiker.com/