I tried the google 'I'm lucky method' described in another answer but not only does it not work as well as I have to display both websites as well as images via this method so I'd like something bivalent. Does someone have any idea on how I could do this without "blocked http content" messages?
Edit: more information
Using https in a website blocks the loading of iframes with src referred to "http://url...". What I'd like to do is find a way to allow both http images and websites to be loaded directly in the iframe via http. I've tried this solution but it failed, content was blocked anyway. Is there any other way I could go around this? Thank you for your help.