如何安全地在https页面上引用http资源?

I have enabled HTTPS for my site. Some of the resources such as css and js files on my pages come from another domain which is on HTTP. Now the problem is when I visit the page, browsers display an alert message. IE says "Do you want to view only the page content that was delivered securely" and FF says "You have requested an encrypted page that contains some unencrypted information. Information that you see or enter on this page could easily be read by a third party."I have enabled HTTPS for my site. Some of the r