auto-rotate based on the exif information

I'm using droppics for our school website.
All teachers can post their own photo's to the site. Not all of the teachers are skilled in computer matter.
So one of the problems we face frequently, is that they upload their photo's and the orientation of the photo is wrong.

I'ld like a way to let uploaded photo's show with auto-rotate based on the exif information of the file?