Thank you for your post.
FileMaker Pro 5 Unlimited will allow you to share your files over the web. However, FileMaker Pro 5 is an old product, and the current release is FileMaker Pro 9, and that too allows you to share your files over the web. That is, everyone can work on the same database file at the same time.
For more information about FileMaker Pro 9, please see our product web site at:
You might find these search result links to be useful.
Filemaker Custom Google Search
Search "instant web publishing"