EXCELLENT WORK DPR - It's Appreciated.

So something like 17% of users have 1024x768 or smaller screen resolution.  (And at least 35.5% have 800 or less in at least one dimension.)

Now, is that actually the screen resolution, the size of the window the browser is in, or the size of the window in which an image is displayed?

Regardless though, even at 17% you don't want to alienate a set of users that large by assuming nobody would use a screen that size and making it impossible to use effectively!