Here are the files. [url removed, login to view]
There are two issues.
1. Under firefox the larger thumbs that appear when you move your mouse over the smaller thumbs sometimes don't fade away. They will just pause half way through the fade out. The crucial part is line 289 of the layer2's action script. To repeat the bug, click on a thumb then move the mouse directly down. Within about 10 thumb selections the large thumb wont fade away.
To see an online demo go to here [url removed, login to view];ns=display&ref=gallery and select Compact cameras gallery.
2. The large thumbs should fade out nicely like on this flickr viewer as on this link
[url removed, login to view]
Move your mouse backwards and forwards over the thumbs to see the effect.
If you can do the first part, which should be a few lines of code and show a demo first I will close the bid, providing the price is right. If you can only do the first part that is ok. I will consider splitting the bid.