使用安全服务器时,从无安全站点嵌入外部JS

This might seem like a strange question, but I have a secure website which is trying to access an external Javascript file.

The only problem is that the file is coming from a none secure location, going to it through https:// brings up a warning saying it's insecure which means it won't work when using...

<script src="//site.com/script.js"></script>

Has anyone got any suggestions on how I can embed the script so it works? Maybe some magic PHP which could help?

I have tried to do a little searching around, but I have had 0 results so any help on this would be greatly appreciated.