When I ceated my site using Frontpage I had a similar problem caused by inserting pictures from the wrong folder on my hard drive, so when Frontpage transfered the files over to the Hosting company the pointers to the files were wrong. I sorted it by looking at where the Web page was expecting to see them and manually transfering them over using WS_FTP Pro. I think the problem is probably caused by not really understanding how to construct the Site in Frontpage in the first place, ie. Inserting them from the My Docs folders directly rather than copying to the correct Frontpage folder and then inserting them. Hope this helps.
It sounds as though the picture files haven't uploaded properly, it happens sometimes with FP's Publishing function. Also check that the path to the pictures is correct and sometimes if you have UPPERCASE LETTERS in the file names, that will case them not to display correctly. Personally I would use an FTP client like WSFTP to upload the files rather than trust the task to FP.
Also any changing of locations of files has to be done in 'folder' view in a specific way (Right-click-drag-move) otherwise the altered hyperlinks won't be linked. So if you moved some of your pics via another way the links will be gone.
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