If its to submit to SBB it needs to be all in one zip file - see here:
http://scrapbook-bytes.com/cgi-scrip...icle_262.shtml
If you have XP you dont need to use a third party software like winzip - you can simply right click and choose Send To Compressed(zipped) folder. You can do this for each folder or do it for one file and drag and drop other files into it.
HTH