Contact form getting stuck

Hi my contact form at http://bit.ly/9mP1JN is getting stuck on submit, the email gets sent to me via email but the page doesn’t reload and gets the whole site stuck. What can be the problem?

Code?

Need to see the code. Could be anything.

I just tested the contact page and it seemed to have worked.

“Thanks for contacting us! We will get in touch with you shortly.”

The curious thing is that it only happens on Firefox, Chrome and IE work fine.