Getting a handle on security certificates

Getting a handle on security certificates
"Pages with secured and unsecured content... There’s another common certification-error message. Go to a website that includes SSL security (as noted by the https:// in the URL). While on the site, you get this message: “Do you want to view only the webpage content that was delivered securely?” In this case, the site is providing both https (secure) and http (unsecure) information on the same webpage."