Ok, here what I got:
Firefox - Email is empty when I 1st click, and then nothing happen when I double click again.
IE - Got error message...
Row: 2180
Char: 19
Error: 'length' is null or not an object
Program code: 0
Since error message is in Chinese, I think english is almost same...
Email is from
www.jobsdb.com(Choose Hong Kong to subscribe newsletter), not all email have error from it, only advistisment is...