CSS photogallery scroll

[maxop]

Hello everyone!
I just built up the css photogallery here:
http://dexxtra.eu/backgrounds/backgrounds.html
The problem is that enlarged image stay fixed and when I want to view the bottom images and I scroll the enlarged image stay on the top - not visible. How to fix this? Now i have :.thumbnail span{ /*CSS for enlarged image*/
position: absolute;
Any help appreciated. Thanks

[maxop]

OK, Ive got it:
Position:fixed
.thumbnail:hover span{ /*CSS for enlarged image*/
visibility: visible;

top: 200px;
left: 850px;

The other problem is when I zoom + , the inlarged image is shifted to the right and half is not visible.