I need an addon or script that will make the address bar show that the SSL on my site is still secure even when embedding an outside image.
Yeah, just means something insecure was transferred by the browser when rendering the page. I was just pointing out that it doesn't actually break the underlying encryption/SSL on the page. If you care about what color the lock is in the address bar (personally, I don't on my site), you would need to proxy the images through something secure. For example have a script that you call the URL as the parameter, it downloads it and spits it out. The downside is it will be more bandwidth since all images would be going through your server then, and images would load a little slower since it has to go out and download them underneath it all.