not the point... i'm not looking for a particular picture. i would simply use iphoto to do that.
what i mean is, if my photos screensaver is going through the pictures (in random order), and i see one that i want to go back to (e.g., one of my 5 year old when he was 6 months old), i could (on a windows computer) go back to the previous picture simply by pressing the back arrow. you can't do that with a mac. i guess it's one of those things that steve jobs & co. either didn't think of, or didn't think was important.
what i'm asking is, are there any 3rd party screensavers out there that do this?