OK, so I'm running CKEditor 3.2 via the excellent rails-ckeditor plugin for RoR. Our web editor noticed that when she puts in an image, e.g.
<img style="width: 636px; height: 750px;" _cke_saved_src="http://site.com/style_0410_article1.jpg" src="http://site.com/i/style_0410_article1.jpg">
Re: Riddle me this, Batman: break and image tag swap