Image Thumbnail viewer II Additional Capabilities

I've used the Image Thumbnail Viewer II (http://www.dynamicdrive.com/dynamici...thumbnail2.htm)successfully on my site, but need additional capabilities. Two of them to be exact (to occur on separate links, not on the same one) .

First additional capability: once the image has been enlarged onclick, I would like the enlarged image to change to another image onmouseover.

Second additional capability: once the image has been enlarged onclick, I would like the enlarge image to be a link to an external website onclick.

Here is my webpage that says the same thing I've stated above, but in more detail:

http://buenadesigns.com/sample1.html

this is my take on that script