Cross domain scripting to embed HTML

Cross domain scripting to embed HTML

I'm trying to set up a system similar to Google AdSense that allows other websites to display some HTML content from my site on theirs. I've looked at the show_ads.js file Google uses to display Ads but to be honest I've not found it easy to decipher. I've also read that using a <script> tag to load a JavaScript file from my site is simpler than trying to do do this with an AJAX request. This post was helpful, but it discusses returning JSON rather than HTML.

Will someone please explain how this can be achieved using jQuery? A simple example with code would be really appreciated

BTW I know I could use an iframe to achieve something similar but this won't give me the result I need because the content coming from my site will contain a link back to my site and I want the link to be registered as an inbound link to my site for SEO reasons.

Many thanks