How do I link one button to two slices?

Two points.

First, I see that you have star shapes in your image, but that doesn't mean
you need a star shaped slice. You can use a small square that is centered on
your star. That might make creating your slices easier. All you have to do is
drag lines out from the rulers at left and top, place two pair around each
star, and then drag a slice from one corner to another.

Noting this leads me to my second point: images have to be rectangular. If you
want to swap the L-shaped area, then you need to swap two images, not one. This
may be why you can't make buttons below the top guide line of your L-shaped
slice.Because Fireworks needs to make a rectangular image it defaults to an
area that encompasses the slice - the area you can't make buttons in. It's
locking out the non-sliced are that will still need to be part of the image,
since that part will flip, too.

Thank you pixlor, I did not know that I couldnt slice an image like that. Back to the drawing board then. Thanks everyone for your help.

Good catch pixlor.
I got the same result as Raven.

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Thanks Darrell! :grin; Yeah...no matter how much we try to break out of the
box...we're still stuck with rectangles!

RevenMurder, you're welcome! :smile; Sorry it isn't an easy answer.

It is possible to get the effect you have designed. You can code for changing
two images with one mouseover, but you have to do it yourself or find some
JavaScript code somewhere. With your overall design, however, I would recommend
making the microscope one image with an image map rather than a bunch of small
sliced images (unless you really need those stars to change color or display
some other effect). Everywhere you have slice boundaries, you'll cut that image
and the result will be a really nasty HTML table.

Good luck!

thanks for the help about the shapes like slices, sphers and others.favour me by giving more information on it.