OK, had a quick google and test, found a script at http://www.abdulqabiz.com/blog/archives/2007/05/31/php-proxy-script-for-cross-domain-requests/
that you stick on your not https server, you give it a url parameter that includes https and it returns the results. The URL parameter must be encoded so that the parameters are passed to their ultimate destination.
As an example, I've stuck the script onto one of my sites running PHP and told it to return the paypal-business page hat uses https - http://blog.thiseldo.co.uk/proxy.php?url=https%3A//www.paypal-business.co.uk/
Its not going to return full pages and images, just the text or html output from the request you submitted, which is probably what you are looking for.
Hope this helps