simple multiple logo animation

I have looked through the web looking for a "simple" example of how to created
an animated GIF of logos. When we received our website from the design company,
they created an animated gif which basically displays the logos of some of our
customers. they are all sized the same. When I open it up in fireworks, I see
all the frames with the logos on frames that display for 2 seconds and then
transition frames fade from one logo to the next. I have tried adding blank
frames in between frames which have the gif logo and clicked on onion skin
before/after, etc, but cannot figure out how to create the fading/mixed logo
for the fade transition. How do you do this? I have one level now which has all
the frames in it, do I need to create new levels with the new gif logos I want
to add to the animation and then somehow make a new combined level. I just
don't get it. thanks for any help you can offer (btw- the animate logo is on
our website www.boardwalktech.com

The transition from one logo to another takes four frames. Working with two
logos, you would need to create the two intermediate images like this:
- Place logo1 above logo2
- Set the opacity of logo1 to 67%; export this as intermediary1
- Set the opacity of logo1 to 33%; export this as intermediary2

Now, construct your animation with the four images:
- logo1
- intermediary1 (mostly logo1)
- intermediary2 (mostly logo2)
- logo2

And so on. For each pair of logos, you need to create two new images to insert
between them.

I don't know if Fireworks has any automatic transitions. I know there are
animation programs that do, though. Hmm...Fireworks Help mentions tweening, but
for symbols, and if you only have a few logos to add, the manual method might
be easier.