XHTML mode easy to break

Aside from the fact that you can't put SCRIPT or STYLE tags in the editor when XHTML mode is enabled, simple HTML can break it completely.

For example, take this content:

http://www.giftplanning.duke.edu/custom/breaks_fck.html

Take the html source, which btw validates perfectly when you add the html, head, and body tags and the doctype....

Anyway, take the source, and put it in the demo editor on fckeditor.net

Switch to source view and back a couple times and note the javascript errors.

Use IE to do this.

This same code works fine when XHTML mode is disabled.