Animating in Fireworks is hard. I think it was Noel Coward.
Comedy is hard.
Regardless, in the past when I had to create animation for the Web, I invariably sought out programs like Macromedia Flash or Director. But now Macromedia claims Fireworks 4.0 has come into its own as an animation platform for the Web. The first thing one notices about trying to build an animation in Fireworks is the lack of a traditional timeline window. In Flash, Director and Adobe Live Motion designers can visualize the structure of their animation because they can see every frame and every layer of their project at the same time. It's considerably easier to see how various layers effect other layers this way.