You sir are awesome! IMHO, you must be hired by google for this! For years people were asking for something like this script on tech support forum and unfortunately they didnt have any reaction. Thank you!
Works as said, and is very helpful. The one thing I would ask is if it would be possible to make the comment box appear beside the comment, rather than near the top of the page? I'm aware you can move it, but it would make it a little more accessible and would bump this review up to a 5 star.