This is similar to this mod
except the center image now links to the Intermediate page.
1. Same as most of my mods, drop the 3 files (flow_link.php, flow_link.swf, AC_RunActiveContent.js) to the root of your gallery
2. Modify the Flash script (example inside flow_link_example.htm) to indicate the absolute path to flow_link.php on your server
3. Include the script in your anycontent (or for the advanced, put the script anywhere on your site)
I will take a limited amount of custom requests, if my time permits. I'll subject line it with the custom attachment.
The images are currently 160x120 and the exact dimension of the Flash file is 900x400 (most users, I believe, are 1024x768 display resolution or greater). You could probably adjust it minimally without too much distortion. Currently, the flow_link.php picks up the last 20 images loaded to your gallery (respects private albums). You can change this to whatever you like (eg., ORDER BY RAND() LIMIT 20, specific album, etc).
If I forgot anything, let me know. Enjoy !