Secure embedded form in a blog

Secure embedded form in a blog

Hi,
I put an embedded form in a blog, but when people click on it the browser (Firefox or Mozzilla) display that's exist a problem with security certificate. Really browser adivice that isn't a security problem, and the certificate it's know, but that isn't the same certificate of the site. We can do anything?
Anyone have experienced the same issue?
Thanks

Mic