elementel,
Thanks for your update. I tried it, but after adding your line, the thankyou page does not load and I noticed the following error message on the page:
Message: Invalid character
Line: 95
Character: 57
Code: 0
URI: https://www.mysite.com/wp-content/plugins/contact-form-7/contact-form-7.js?ver=2.0.2
Any thoughts? I use Atahualpa.