New on the Ask About PHP blog today there's a tutorial about using PHP and jQuery to submit a form without having to submit the entire page.

Lately, I’ve been chancing on quite a number of posts at various places asking about how to perform a web action without the webpage reloading/refreshing? For example, dynamically updating a list on a page without a reload or submitting a form to PHP without leaving the webpage the form sits on. I guess this is as good a time to start branching into some posts on PHP and Javascript, or more specifically, jQuery.

You can just download the code of you want to get started right away or you can follow along with the tutorial for code, flow diagrams and a full definition of how it all works.