Easy Animation Using the Horizontal Transform Feature
Copy and paste the image below in Fireworks:

Open the Frames Panel (Window > Frames). Duplicate the Frame by dropping down the Frames Menu
and selecting duplicate frame:

At the Duplicate Frame dialog box set the settings below:
You now have two frames containing the same picture. Click on Frame 2 then click on the Layers tab to return to the layers panel:

At the layer panel click on the layer that contains the picture, it will turn blue as shown below:

Now you need to click Modify on the Menu toolbar > Transform > Flip Horizontal.

This makes a mirror image of the juggler in frame two as shown below:

Now we need to set the frame rate so that it moves slower than the default 7 rates per second. Return to the Frames Panel by clicking on the Frame tab. Select both Frame 1 and Frame 2 by holding down the shift key and clicking on Frame 1 and Frame 2. Both should be selected as shown below. Double click on the number 7 and type in 35.

On the loop setting at the bottom of the Frame Palette, set it to forever if you want it to continue to animate:
To view the animation, click on the preview tab
in the main document window then click the white arrow
to play the animation.
On the Optimize Palette select animated gif as the file format:
Export your file and it is ready to use. How cool was that!!!