BUG: images shown multiple times instead of original website iframe images

This is a proxy server-client software with which we add graphical content to the WEBSITES the user goes in. On client side we need to fix one detail, in some websites our images are appearing multiple times, but we need it to be shown just once (the HTML code of the graphical content is being inserted just once after opening body tag of every website using C++ coding, the HTML is prepared through PHP code). But as some websites use iframes, our images appear instead of the original images (in the space delimited for them) in those websites. This is shown only when user connects to the platform and is LAN connected to server, we're working on beta version.