Dreamweaver creates a very simple, table-based layout for the photo album, and chances are it won't look bad in any modern browser. But it's always a good idea to test your pages in as many browsers as you have available.
Upload your album using the upload button. This will make sure that all the files, images, and thumbnails are uploaded to the correct location. If you don't have a site defined in Dreamweaver, you'll need to define one to have this work correctly. You'll also need to set up that site to transfer files