When exporting from Fireworks, consider the structure of the Web site where the Fireworks images will go. When Fireworks writes HTML or JavaScript, it references the destination you choose for the image files and the HTML file when exporting.
In Dreamweaver, you work on a local copy of the Web site that mirrors the site as it will be when you upload it to your Web server. It is usually best to export your Fireworks files directly into the working folder of your Dreamweaver site.