Force browsers to load unsecured content
I have an existing iframe application (php) that pulls in another web address. The problem is that the iframe is being utilized on an https site and pulling in a http site. Everything was working great but now some people are experiencing the browser blocking unsecured content and it just loads a white page rather than the pulled in content.
Is there a way to force browsers to load unsecured content into the https page without each user having to check "yes, allow content".