Wordpress Javascript / AJAX project

I'm running a Wordpress blog using a caching program, but there is output from a widget that I don't want to be cached. I want to use Javascript or AJAX so it will be reloaded every time a user visits. The blog is using W3 Total Cache: [login to view URL] I want the Ozh who sees ads plugin to be compatible with it. [login to view URL] You don't have to use Javascript or AJAX to make this work. As long as you have a solution that makes Ozh who sees ads with W3 Total Cache I'm fine with that!