It's really up to you. If the websites on your network agree to add a component to their website you can technically implement this with an IFRAME or any compon

It's really up to you. If the websites on your network agree to add a component to their website you can technically implement this with an IFRAME or any component with JavaScript that references some JavaScript file of yours. You can even do it with an image URL, but the image URL won't cycle without the aid of a script. However, it's likely that your thinking of a page based solution, and not a dynamic solution for single page AJAX like websites. All the above will work, now it's up to you which you prefer.