Add Lightbox Effect to 2 Pages

Present an image using Lighbox effect over 2 pages. One image should be presented over a simple aspx page. Second image should be presented over a page containing big Flash object. Both images should be presented over the page like in this example: [login to view URL] Images should be presented on [login to view URL] and [login to view URL] Files should be created in a way that it is easy to replace the image at any time