Search the forums for importing images. There were many discussions about importing images into flash, my advice is to import the image as a lossless compression , PNG, and then let flash compress your image into jpeg. this way the image only is compressed once, not twice as it would if you sent a compressed jpeg and then compress it again in flash. Like i said do a search and you will find many more threads on this issue.
:: And if your saying that exporting is different in fireworks, it is no different than exporting from any other image editing application such as photoshop.