I was looking for a image magnification tool and came across tjpzoom.
Easy to implement in FW, the great thing about it is the quality of the magnification can be as high as you like
and it does not drain your page size. For high quality magnifications you assign another image for it to see. The series of view windows can
be tweaked to you’re liking and your visitor can also turn the function off or on if you want.
Things to note is it will only work with non-layered jpeg images.
You can take a look at my test page and click the source to get the download.