How are you importing them, just using the File > Import and then inserting
them into the page? I ask because some people try pasting them into a web
page from another application and this doesn't lead to the best quality as
FrontPage edits the photo in this case and it just wasn't designed for it
like a true photo editor like PhotoShop would be.
One of the things to keep in mind, normal photos used in web sites are a
much lower dpi than what we would want for a photo to use for print
purposes. For example, most photos on the web are 96 or 72 dpi. A good photo
that we would put into the family album is more like 600 dpi, which is a
much better picture than what is useful for the web.