Script Not Working with https

Hello, seems to be a plugin with high potential but it is not working on https:

(index):1 Mixed Content: The page at ‘https://onehost.at/responsive/#’ was loaded over HTTPS, but requested an insecure resource ‘https://bcsag.de/’. This request has been blocked; the content must be served over HTTPS.
4bcsag.de/:1 Refused to display ‘https://bcsag.de/’ in a frame because it set ‘X-Frame-Options’ to ‘SAMEORIGIN’.

Any Idea / Patch / Update?

Thanks in advance!

Joerg