Are there any Ajax frameworks for windows?

I have a project with a lot of pop-up layers, and as long as I have one layer, this layer will serve as another window. I am currently managing this with _json specific return pages that only return json objects and the layer acts on that. Each call from the slot comes from a jquery.ajax call that processes the json and requests a different page.

Is there a more definite framework for this kind of MVC interaction? I control the creation of the layer, going from level 1 to layer 2, and lighting the layer with some code, but it quickly becomes unwieldy.