I have been tinkering with a client-defined-crop-area for thumbnails script and have got it working in moz1.1+ IE (umm 6+ - untested) though am sure the coding can be improved greatly.
Anyone fancy attacking the clientside bits while I improve the serverside backend? (will happily add comment/link for any helper).
Failed to get Opera to show localhost image.
Crop boundary still a few pixels out - should be an easy fix.
Displayed image should (maybe) be relative to visible area, rather than mouse position.
Sloppy - dated - archaic - nonDOM coding.