El, Have a look at this
http://photobucket.com/ perhaps that's what you are looking for?
I imagine you just upload your photos to it and get a user name and pass word to view them. I expect Sion could grab the photos he wants from the site too if he has everyone's passwords...
I haven't tried it but it looks straight forward and the sample album contains pretty large, good quality pictures.
A quick google search reveals loads of these free album sites, this is just the first one I looked at.
Derek.
<Added>Elspeth/ Sion, try linking to this (another site that offers better resolution pictures)
http://dham.photosite.com/nevadapics/?page=1
It's just some of my holiday snaps. Try saving and viewing a photo to see if it's possible. If it is then Sion could use this to grab our pictures as he needs them...