Quiz

your secure/unsecure issue is probably an SSL certificate issue. Does one of your schools use https:// for the quizes? If so, the quiz is transmitted securely between the server and your computer. Putting links to a 3rd party server in your question (your images are being pulled from a different server), means they are unsecure, because they are being pulled from elsewhere. This pops up the security warning message. If you put the images on the same server, they will also be secure and the message won't be a problem. If they are, make sure your img links are https://
Ciao,
Nilauro