Is there a way to load an iframe going from HTTPS to load HTTP inside a secure iframe?

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Question: We are using the HTTPS secure domains for most sites, but I have one site that HTTP as there is a link to another site which is insecure. Is there a place where I may be able to load an iFrame going from HTTPS to load HTTP inside a secure iFrame?
 
 
It is not possible to load a source from HTTP if the site is using HTTPS in Pressero and vice-versa. You can use some custom external proxy which will load unsecured from HTTP and provide a response as secured to show in iFrame on Pressero site.