Thank you for at least trying to find the answer to this
much asked question on this newsgroup. Most other folks
do not do this.
The first step in the creation of your website using
Front Page should be File | New page or web | Web (may be
slightly different menu items depending on your version
of Front Page). When you do this , Front Page will create
a special folder (look for a "globe" as the icon when you
view the folders on your computer).
This special folder, sometimes called a disk based
web, "mirrors" the site that will eventually be published
to your host. That is sometimes called a server based web.
All of the contents (pages, pictures, etc) should either
be created in this special web or imported into this web
prior to assigning hyperlinks to connect things together.
If you did not create this web but simply jumped in and
created web pages, Front Page will assume the hyperlinks
refer to files that are not located in your web but those
contained on your C drive. When you test your server
based website on your PC, you will see the pictures
(because your C drive is there to access them from). When
you test it on other PC's you will not as they do not
have access to your C drive.
You should be able to right click on this folder and
select the option to convert the folder to a Front Page
web (I forget the exact wording of the menu option).