JS Error with particular section

We have a custom section that is throwing us a JS error. It didn't happen some days ago. We are using 10.0d

I attach a html to reproduce the issue.

Here it is also a video showing how it is reproduced (just open the html): http://screencast.com/t/FsSBAf7kVl

Thanks.

Attached Files

IssueForm.html (6.4 KB)