problems with frontpage photo album

[Bren]

Hi, I am a novice at this. I have created a website in Frontpage and its
published to the web. I created a photos page. I am using the FP photo album
and I am uploading photos from my files into it. Fine. The first time I did
it, it all worked absolutely fine and the photos appeared on my web page.
However, when I tried to add more photos to the album, the added ones all
appeared as blank boxes with a red cross. then some of the graphics on other
pages wouldn't upload either. However some photos on other pages are
appearing OK.

I decided to scrub the photos page and start again, and this time, none of
the photos appear on the web page. The photo extensions are numbers i.e.
1234.jpg and this is how they appear on the left hand side of my screen where
my list of files are. However, when they are uploaded into the photo album
programme, they appear with the number extension and then .jpg.jpg. Is this
why they aren't uploading to the web?

As I said, I am a novice so any technical language will be lost on me, so
simple explanations please!!!
Thank you
Bren