Just for completeness's sake: 😝
You can't view photos at icloud.com with a browser, because the only photos than can exist on icloud are 1) in a backup of a device, not a mac, and 2) in photo stream (do you have it turned on?); but that only stores up to 1000 photos for up to 30 days.
and 3) Journals published to your iCloud homepage. But you need iPhoto on an IOS device to do that.
iPhoto for iOS (iPad): Share your journal as a webpage
and 4) Shared Photo Stream: iCloud: Using and troubleshooting Shared Photo Streams
Shared PhotoStreams do not expire after one month and can be pulished as a web page.
Mt. Lion allows you to view your photos as a web page, oonly this will not help clockworkmagic to retrieve the photos.
clockworkmagic: To repeat pvonk's question - we really need to know how you tried to share the photos:
The "sharing" box, exactly where is this? System preferences? iPhoto?...?