Assuming FP is FrontPage, I'm guessing that the problem is that your "video" is actually an HTML document with links to the images embedded in it. If you're just previewing on your computer, the images probably have to be in the same directory as the html file. If that's the case, you'll have to upload all the images as well to your website for it to work there.
Other ways to do this:
Make an animated gif set of the images and upload that. There are free programs on the web that will allow you to do that. The resulting file will be in .gif format which is a web format. However the conversion to .gifs may result in quality loss. I do this on one of my client's sites,
www.benoraimaging.com if you want to see an example.
Or if you have access to a video editing program like Premiere Elements or Sony Vegas, import the stills, sequence them and save them as either a .wmv file or .mov(if you want mac compatibility) file and upload and link to that file on your website.
Frontpage has some weird non-standard quirks, that's why most designers don't use it. You also want to validate any FP code on a Mac(for the 3% of those who are non-PC)
Without knowing what you've done, it's hard to guess what's wrong. If you want, upload it and post a link to the page here so I can look at your code.